Here are the latest Rogue changes that went live recently on the War Within Beta.
Latest Rogue Changes
Assassination ability damage increased by 15%. Outlaw ability damage increased by 20%. Subtlety ability damage increased by 20%. Flensing Knives - Slice and Dice causes your Backstab to deal an additional [ 20% 40% of Attack Power ] Plague damage. Darkest Night - When you consume the final Deathstalker's Mark from a target, gain 60 40 Energy and your next Envenom cast with maximum combo points is guaranteed to critically strike, deals 30% 60% additional damage, and applies 3 2 stacks of Deathstalker's Mark to the target. Hunt Them Down - Autoattacks against Marked targets deal an additional [ 10% 20% of Attack Power ] Plague damage. Lingering Darkness - After Deathmark expires, gain 3 30 sec of 10% increased Nature damage. Deathstalker's Mark - You may only have one target Marked at a time. Ambush from Stealth applies 3 2 stacks of Deathstalker's Mark to your target. When you spend 5 or more combo points on attacks against a Marked target you consume an application of Deathstalker's Mark, dealing [ 30% 60% of Attack Power ] Plague damage and increasing the damage of your next Ambush or Mutilate by 10% 20%. Flawless Form buff duration increased to 12 seconds (was 6 seconds). Unseen Blade damage increased by 36%. Nimble Flurry (Outlaw) now increases Blade Flurry damage by 15% (was 10%). Nimble Flurry(Subtlety) now deals 40% of listed abilities’ damage to nearby targets (was 15%). Nimble Flurry (Subtlery)now includes Echoing Reprimand, Goremaw’s Bite, and Unseen Blade in addition to currently listed abilities. Tooltip will reflect this change in a future update.

Players have spotted some strange anomalies in Westfall on the War Within Beta! What could they mean?
The image shows Westfall's landscape with an anomaly in the ground characterized by jagged, spike-like formations emerging from the earth. The spikes are sharp and irregular, surrounding a central area filled with what appears to be molten lava.
Special thanks to derpderp235 for the screenshot!

What’s strange is that these formations keep moving and appearing in different spots. They’re nowhere to be seen on live servers.
Source: Reddit

Now that Mythic N'Zoth is soloable, let's take a closer look at how to efficiently defeat the final Battle for Azeroth raid boss for a chance at the Mythic mount!
Mythic N'Zoth has a small chance to drop the Ny'alotha Allseer mount!

How to Get to Ny'alotha
If it's been a while since you've visited, here's a quick refresher on how to find the raid entrance to Ny'alotha and defeat N'Zoth for a chance at the Mythic mount.
The raid entrance is located in either Uldum or the Valley of the Four Winds (Pandaria). To get there, use the Cataclysm portals in Stormwind/Orgrimmar or the portal room portal to Jade Forest.

Sanity Changes
The raid takes a while to clear, but once you reach N'Zoth, you'll notice that you no longer need the Heart of Azeroth or cloak! When you lose your sanity, you won't get mind-controlled. Instead, your sanity will reset to 30, and you'll get a buff that increases your damage and healing by 25% for a short time. So, losing all your sanity can actually be beneficial.

How to Efficiently Kill N'Zoth
There are still a few "checks" to pass so you don't instantly wipe during the fight. I wiped a few times myself because who has time to read the journal, right?
When you engage N'Zoth, he has a shield that reduces damage taken by 99%. To open a portal to the brain room, kill tentacles until you see a message pop up:

This means you can now port to N'Zoth's brain room. Enter the puddle on the ground before N'Zoth finishes his cast, or you'll be instantly killed.

Inside the brain room, don't move. Let Psychus walk towards you, then kill him and click on the Severed Consciousness.
Moving inside the brain room can be confusing, and if you don't return in time, you'll be instantly killed. That's why staying in place is best.

After clicking the Severed Consciousness, N'Zoth will lose his shield in the normal phase and can be attacked. Nuke him until he regains his shield, then wait for the puddle to spawn, enter the brain room again, kill Psychus, and click the Severed Consciousness. Repeat this process until a Dimensional Gateway to the Chamber of Heart opens.
With all the tentacles and goo on the ground, finding it can be tricky. Once you do, make sure to enter it.

Inside the chamber, kill the boss and return back. Now you can fully nuke N'Zoth and hopefully loot the Ny'alotha Allseer!
You don't need a Level 80 char to solo Mythic N'Zoth. He's perfectly doable with a Level 70 char.

I'm not sure what's causing the blue hue on the Beta, but it's been there since the very beginning.

MoP Remix will overlap with the XP nerfs coming in the War Within pre-patch, allowing you to level up your characters to 70 faster than ever.
The MoP Remix event will end on August 19, 2024. Currently, you can reach Level 70 in about 2 hours during this limited-time event, but that doesn't stop there!
The War Within pre-patch is set to reduce the XP needed to reach Level 70 by a whopping 54%. We anticipate this pre-patch will go live on July 22, 2024, which means MoP Remix will still be ongoing!
We saw a player reaching Level 70 in just 48 minutes in MoP Remix, and with the massive XP nerfs in the pre-patch, that time could be cut in half!

Check out the table below to see a comparison of the current XP requirements per level with the new pre-patch values. If you're looking to level up some last-minute characters before the War Within, July 22 is the perfect time to do it.
Level XP Required on Retail XP Required in War Within Pre-Patch Change in Percentage (%) 1 250 250 0.000000 2 590 595 0.847458 3 1065 1085 1.877934 4 1675 1715 2.388060 5 2420 2485 2.685950 6 3305 3405 3.025719 7 4325 4460 3.121387 8 5485 5660 3.190520 9 6775 7005 3.394834 10 8205 8490 3.473492 11 9765 8150 -16.538658 12 11030 9210 -16.500453 13 12360 10335 -16.383495 14 13755 11510 -16.321338 15 15220 12745 -16.261498 16 16750 14035 -16.208955 17 18345 15385 -16.135187 18 20005 16790 -16.070982 19 21730 18250 -16.014726 20 23525 19770 -15.961743 21 25385 21345 -15.914910 22 27310 22975 -15.873306 23 29305 24665 -15.833476 24 31365 26410 -15.797864 25 33490 28210 -15.765900 26 35680 30070 -15.723094 27 37935 31985 -15.684724 28 40260 33960 -15.648286 29 42650 35985 -15.627198 30 45105 38075 -15.585855 31 45590 38430 -15.705199 32 46005 38725 -15.824367 33 46360 38970 -15.940466 34 46655 39155 -16.075447 35 46880 39280 -16.211604 36 47045 39355 -16.346052 37 47145 39370 -16.491675 38 47185 39325 -16.657836 39 47160 39225 -16.825700 40 47070 39070 -16.995963 41 46915 38860 -17.169349 42 46700 38590 -17.366167 43 46420 38265 -17.567859 44 46075 37880 -17.786218 45 45670 37440 -18.020582 46 45200 36945 -18.263274 47 44670 36395 -18.524737 48 44070 35785 -18.799637 49 43410 35115 -19.108500 50 42690 34395 -19.430780 51 47565 36305 -23.672869 52 52600 38265 -27.252852 53 57785 40275 -30.301981 54 63135 42330 -32.953196 55 68635 44430 -35.266264 56 74295 46580 -37.303991 57 80110 48780 -39.108726 58 86085 51030 -40.721380 59 92215 53320 -42.178604 60 194815 55665 -71.426738 61 214540 58055 -72.939778 62 234805 60490 -74.238198 63 255610 62980 -75.360901 64 276945 65510 -76.345484 65 298820 68095 -77.212034 66 321235 70720 -77.984964 67 344185 73400 -78.674259 68 367675 76125 -79.295574 69 391700 78895 -79.858310 MoP Remix characters will be ported to retail when MoP Remix ends.

Here are the latest Paladin changes form the War Within Beta!
Latest Paladin Changes
Laying Down Arms - When an Armament fades from you, the cooldown of Lay on Hands is reduced by 15.0 sec and you gain Shining Light or Infusion of Light. Holy Shock - Has an additional 10% critical strike chance. Generates 1 Holy Power. Triggers a burst of Light on the target, dealing [ 48.96% of Spell Power ] Holy damage to an enemy, or [ 147.36% 190% of Spell Power ] healing to an ally Shining Light - Every 3 Shields of the Righteous make your next Word of Glory cost no Holy Power. Maximum 2 stacks. Tyr's Deliverance - Allies healed also receive 10% increased healing from your Holy Light, Flash of Light, and Holy Shock spells for 12 sec. Releases the Light within yourself, healing 5 injured allies instantly and an injured ally every 1 sec for 20 sec within 40 yds for [ 35% 30% of Spell Power ] Dawnlight - 10% of Dawnlight's damage and healing radiates to nearby allies or enemies, reduced beyond 5 targets. Casting Holy Prism or Barrier of Faith causes your next 2 Holy Power spending abilities to apply Dawnlight on your target, dealing [ 300% of Spell Power ] Radiant damage or [ 600% 480% of Spell Power ] healing over 8 sec Grand Crusader - Reduces the cooldown of Judgment by 3 sec. Normal, Blessed Hammer : When you avoid a melee attack or use Crusader Strike, you have a 15% chance to reset the remaining cooldown on Avenger's Shield Shield. Crusader's Judgment : When you avoid a melee attack or use Crusader Strike, you have a 15% chance to reset the remaining cooldown on Avenger's Shield Blessing of the Forge - Avenging Wrath summons an additional Sacred Weapon, and during Avenging Wrath your Sacred Weapon casts spells on your target and echoes the effects of your Holy Power spenders abilities. Hand of Divinity - Call upon the Light to empower your spells, causing your next 2 Holy Lights to heal 40% 30% more, cost 50% less mana, and be instant cast. Valiance - Consuming Shining Light or Infusion of Light reduces the cooldown of Holy Armaments by 3.0 sec. Divine Favor (New) - After casting Barrier of Faith or Holy Prism, the healing of your next Holy Light or Flash of Light is increased by 40%, its cast time is reduced by 30%, and its mana cost is reduced by 50%.