Mac users are unable to log in to the game as of the recent War Within Beta build. A fix for the issue is coming on Monday, July 22, according to Blizzard.
(Source)
Due to unexpected technical difficulties, we have not yet been able to resolve login and stability issues in the Beta.
Our next update on this will be on Monday, July 22.
Thank you for your patience and understanding.

Follower Dungeons in the War Within Beta now count towards the weekly dungeon bonus event quest!
Previously, we mentioned that Follower Dungeons didn't give players credit for the weekly dungeon bonus event quest. However, this has been fixed in the Beta. Now, to complete the weekly quest for 1,500 reputation or 1 Renown with a faction of your choice, you can simply run Follower Dungeons!
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Check out the latest Evoker changes from the TWW Beta!
Evoker
Verdant Embrace - Fly to an ally and heal them for [ 418% 501.6% of Spell Power ], or heal yourself for the same amount. Spiritbloom - II: Heals a second ally. III: Heals a third ally.. I: Heals one ally. Splits to injured allies within 30 yds when empowered Divert spiritual energy, healing an ally for [ 508.5% 610.2% of Spell Power ] Unravel - Sunder an enemy's protective magic, dealing [ 655% 720.5% of Spell Power ] Spellfrost damage to absorb shields. Maneuverability - Deep Breath can now be steered in your desired direction In addition, Deep Breath burns targets for [ 480% 600% of Spell Power ] Volcanic damage over 12 sec. Ruby Embers - Stacks 3 times. Living Flame deals [ 24.1% 26.51% of Spell Power ] damage over 12 sec to enemies, or restores [ 40% of Spell Power ] health to allies over 12 sec Shattering Star - Grants Essence Burst. Normal: Exhale a bolt of concentrated power from your mouth for [ 209.6% - 230.56% of Spell Power ] Spellfrost damage that cracks the target's defenses, increasing the damage they take from you by 20% for 4 sec. Eternity's Span : Exhale bolts of concentrated power from your mouth at 1 enemies for [ 209.6% - 230.56% of Spell Power ] Spellfrost damage that cracks the targets' defenses, increasing the damage they take from you by 20% for 4 sec. Arcane Vigor : Exhale a bolt of concentrated power from your mouth for [ 209.6% - 230.56% of Spell Power ] Spellfrost damage that cracks the target's defenses, increasing the damage they take from you by 20% for 4 sec Aspects' Favor - Hover activates Bronze Attunement, and amplifies it to increase movement speed by 25% for 4 sec. Obsidian Scales activates Black Attunement, and amplifies it to increase maximum health by [ 3 4.1 2 2.1 ]% for 12 sec Draconic Attunements - Bronze Attunement :You and your 4 nearest allies have 10% increased movement speed. Learn to attune yourself to the essence of the Black or Bronze Dragonflights: Black Attunement : You and your 4 nearest allies have 4% 2% increased maximum health Eternity Surge - II: Damages 4 enemies. II: Damages 2 enemies. III: Damages 3 enemies. I: Damages 1 enemy. III: Damages 6 enemies.. Damages additional enemies within 12 yds of the target when empowered. I: Damages 2 enemies Normal: Focus your energies to release a salvo of pure magic, dealing [ 563.5% 619.9% of Spell Power ] Spellfrost damage to an enemy. Eternity's Span : Focus your energies to release a salvo of pure magic, dealing [ 563.5% 619.9% of Spell Power ] Spellfrost damage to an enemy Pyre - Lob a ball of flame, dealing [ 158.18% 174% of Spell Power ] Fire damage to the target and nearby enemies. Time of Need - Your alternate self continues healing for 8 sec before returning to their timeline. May only occur once every 60 sec. When you or an ally fall below 30% health, a version of yourself enters your timeline and heals them for [ 418% 501.6% of Spell Power ]

Great news for everyone who pre-ordered the physical War Within Collector's Edition! It's now shipping worldwide.
Early access for The War Within starts on August 22. If you pre-ordered the Collector's Edition from the Gear Store and haven't received your box yet, don't worry—you'll get it soon.
The Collector's Edition is no longer available at retailers and is only offered in the Blizzard Gear Store, notoriously known for its high shipping costs to Europe.

Here are the latest Druid changes from the TWW Beta including the recent Guardian nerfs.
Druid
Tooth and Claw - Autoattacks have a 20% chance to empower your next cast of Maul or Raze, stacking up to 2 times An empowered cast of Maul or Raze deals 40% increased damage, costs 100% less rage, and reduces the target's damage to you by 15% 12% for 6 sec. Renewal - Usable in all shapeshift forms. Instantly heals you for 30% 20% of maximum health Rage of the Sleeper - Unleashes the rage of Ursoc for 10 8 sec, preventing 25% 20% of all damage you take, increasing your damage done by 15%, granting you 25% 20% leech, and reflecting [ 47.25% of Attack Power ] Nature damage back at your attackers. Harmony of the Grove - Each of your Grove Guardians increases your healing done by 3% 6% while active. Durability of Nature - Your Grove Guardians' Nourish and Swiftmend spells also apply a Minor Cenarion Ward that heals the target for [ 80% 160% of Spell Power ] over 8 sec the next time they take damage. Survival of the Fittest - Reduces the cooldowns of Barkskin and Survival Instincts by 15%. 12%. Ironfur - Multiple uses of this ability may overlap. Balance, Feral, Restoration, Initial: Increases armor by [ 120% - 112% of Agility ] for 7 sec. Guardian: Increases armor by [ 120% - 112% of Agility ] for 7 sec Pulverize - A devastating blow that consumes 2 stacks of your Thrash on the target to deal [ 135.7% of Attack Power ] Physical damage and reduce the damage they deal to you by 35% for 10 8 sec. Ursoc's Fury - Thrash and Maul grant you an absorb shield for 45% 25% of the damage dealt for 15 sec. Restoration Druid - Restoration Druid core passive Increases damage/healing by 71%: Ferocious Bite, Improved Prowl, Incarnation: Avatar of Ashamane, Incarnation: Tree of Life, Lunar Calling, Mangle, Moondust, Moonfire, Pouncing Strikes, Ravage, Shred, Thrash, Thrashing Claws, Wrath Increases periodic damage/healing by 71%: Ferocious Bite, Improved Prowl, Incarnation: Avatar of Ashamane, Incarnation: Tree of Life, Lunar Calling, Mangle, Moondust, Moonfire, Pouncing Strikes, Ravage, Shred, Thrash, Thrashing Claws, Wrath Increases damage/healing by 2%: 44%: Improved Regrowth and Regrowth Increases periodic damage/healing by 44%: Improved Regrowth and Regrowth Increases periodic damage/healing by 110%: Incarnation: Tree of Life and Rejuvenation Increases damage/healing by 90%: Incarnation: Tree of Life, Lunar Calling, Wrath Increases periodic damage/healing by 25%: 44%: Incarnation: Tree of Life and Wild Growth Increases damage/healing by 73%: Ferocious Bite, Incarnation: Avatar of Ashamane, Ravage Increases damage/healing by 96%: Improved Prowl, Pouncing Strikes, Shred, Thrashing Claws Increases damage/healing by 31%: Improved Prowl and Pouncing Strikes Increases periodic damage/healing by 44%: Improved Prowl and Pouncing Strikes Increases periodic damage/healing by 44%: Improved Prowl and Pouncing Strikes Increases periodic damage/healing by 44%: Improved Prowl and Pouncing Strikes Increases damage/healing by 8%: Adaptive Swarm, Bursting Growth, Cultivation, Dream Surge, Efflorescence, Embrace of the Dream, Grove Tending, Harmonious Blooming, Improved Regrowth, Incarnation: Tree of Life, Lifebloom, Reactive Resin, Regrowth, Rejuvenation, Spring Blossoms, Thriving Growth, Tranquility, Verdancy, Wild Growth, Wild Synthesis Increases periodic damage/healing by 8%: Adaptive Swarm, Bursting Growth, Cultivation, Dream Surge, Efflorescence, Embrace of the Dream, Grove Tending, Harmonious Blooming, Improved Regrowth, Incarnation: Tree of Life, Lifebloom, Reactive Resin, Regrowth, Rejuvenation, Spring Blossoms, Thriving Growth, Tranquility, Verdancy, Wild Growth, Wild Synthesis Grove's Inspiration - Wrath and Starfire damage increased by 10% Regrowth, Wild Growth, and Swiftmend healing increased by 6%. 9%. Bursting Growth - When Bloodseeker Vines expire or you use Ferocious Bite on their target they explode in thorns, dealing [ 70% of Attack Power ] physical damage to nearby enemies. Damage reduced above 5 targets When Symbiotic Blooms expire or you cast Rejuvenation on their target flowers grow around their target, healing them and up to 3 nearby allies for [ 10% 20% of Spell Power ]. Power of Nature - Your Grove Guardians increase the healing of your Rejuvenation, Efflorescence, and Lifebloom by 5% 10% while active. Ursoc's Guidance - Convoke the Spirits : Convoke the Spirits' cooldown is reduced by 50% and its duration and number of spells cast is reduced by 25%. Convoke the Spirits has an increased chance to use an exceptional spell or ability. Incarnation: Guardian of Ursoc : Every 20 25 Rage you spend reduces the cooldown of Incarnation: Guardian of Ursoc by 1 sec Swiftmend - Swiftmend heals the target for [ 136.5% of Spell Power ] over 9 sec. Normal: Consumes a Regrowth, Wild Growth, or Rejuvenation effect to instantly heal an ally for [ 515.2% 618.24% of Spell Power ]. Grove Tending : Consumes a Regrowth, Wild Growth, or Rejuvenation effect to instantly heal an ally for [ 515.2% 618.24% of Spell Power ] Lunar Insight - Moonfire deals 10% 20 additional damage. Earthwarden - Earthwarden may have up to 3 charges. When you deal direct damage with Thrash, you gain a charge of Earthwarden, reducing the damage of the next auto attack you take by 30% 25% Lifebloom - May be active on one target at a time. Heals the target for [ 225% 270% of Spell Power ] over 15 sec. When Lifebloom expires or is dispelled, the target is instantly healed for [ 138% 179.4% of Spell Power ] Potent Enchantments - Reforestation grants Tree of Life for 2 3 additional sec. Harmonious Constitution - Your Regrowth's healing to yourself is increased by 50%. - 35%. Vigorous Creepers - Bloodseeker Vines increase the damage your abilities deal to affected enemies by 5% Symbiotic Blooms increase the healing your spells do to affected targets by 6%. 20%. Implant - Your Swiftmend causes a Symbiotic Bloom to grow on the target for 4 6 sec. Elune's Favored - While in Bear Form, you deal 10% increased Arcane damage, and are healed for 40% 25% of all Arcane damage done. Frenzied Regeneration - Heals you for 24% 15% health over 3 sec, and increases healing received by 20%. Bond with Nature - Healing you receive is increased by 10%. 3%. Cenarion Ward - Protects a friendly target for 30 sec Any damage taken will consume the ward and heal the target for [ 316% 379.2% of Spell Power ] over 8 sec. Bounteous Bloom - Your Grove Guardians' healing is increased by 20%. 30%.