Blizzard has released preliminary patch notes for the 4.1 update to World of Warcraft: Cataclysm. Cataclysm has been out for a few months now and Blizzard is working on the first major content patch for the game.
Some highlights for the first 4.1 test client will include a lot more than the usual bug fixes, class changes and gameplay tweaks. Returning to the fray will be two fan favorite raids featuring the trolls. Zul'Gurub and Zul'Aman are returning as level 85 five-man heroic dungeons. These dungeons will feature epic loot with an item level of 353. Blizzard has not forgotten what made these dungeons so enticing in the first place, the unique mounts. Zul'Gurub will feature new versions of the raptor and tiger mounts. Zul'Aman will feature an updated bear mount.
Blizzard has announced that the 4.1 patch is on the public test realms now. The current 4.1 patch notes can be found here and the latest retail patch notes can be found here.