Blizzard announced realm consolidations for Burning Crusade Classic, merging multiple low-populated realms with Morgraine.
(Source)
Realm consolidations are underway and characters remaining on the following realms are being moved:
Original Realm Destination Realm Celebras Hydraxian Waterlords Zandalar Tribe Hydraxian Waterlords Bloodfang Mograine Dragon’s Call Mograine Dragonfang Mograine Dreadmist Mograine Finkle Mograine Flamelash Mograine Gandling Mograine Harbinger of Doom Mograine Heartstriker Mograine Judgement Mograine Lucifron Mograine Noggenfogger Mograine Razorgore Mograine Rhok’delar Mograine Shazzrah Mograine Skullflame Mograine Stonespine Mograine Ten Storms Mograine Wyrmthalak Mograine

Update: it seems Blizzard have now fixed the bug and the season is back on.
Season 4 (Source)
Our fix for the bug has been tested and deployed. The season has just resumed.
Have a good night!
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Burning Crusade Classic Arena Season 4 abruptly and unexpectedly ended a short while ago, and Blizzard are confirming that it's a bug and is being looked into.
Season 4 (Source)
Looks like a bug. We’re investigating it.

Update: the buff is now live on NA and EU servers as well!
It's time for joy on TBC Classic servers, as the Joyous Journeys 50% extra XO buff has gone live on Oceanic servers. It was late Monday morning for that region when it went up so we should be seeing the buff arrive shortly to EU and then NA, but it's definitely coming today (Monday).
The buff was said to arrive "at least 6-8 weeks" before WotLK Classic's launch, and we've already seen a leaked release date from the official site for September 26th, which is 1 week later, but it's now safe to say September is the target month at least.
In any case, now is the time to level up those classes you may have wanted to try out for WotLK Classic!

It's finally here! After an early launch on Oceanic realms the Joyous Journeys 50% XP buff has arrived to EU and NA servers! Now is the time to get those WotLK classes set up and ready for the new Classic, which also got its officialr release date today. 
Prepare for #WrathClassic with a 50% XP boost.

Live now. pic.twitter.com/UtYJFJChFM

Blizzard have announced that free transfers to the EU Gehennas server will be closing later this week. 
Gehennas (Source)
In order to prevent the Gehennas realm from becoming overpopulated, we will soon close all free transfers to Gehennas.
We expect to implement this closure later this week, in no less than 24 hours from the time of this post.
Thank you.