If you want any info on CLASS changes visit this website, http://www.worldofraids.com/news/208.html
Also, they combined items with Spell Damage and + healing into one stat known as Spell Power, this means that healers and casters will be competing over the same pieces, though items with only one stat will remain the same.
Dalaran is about one third of the size of Shattrath, so no wasted space, less lag, and it looks stunning if you see any in-game screenshots of it.
I've watched the Death knight starting quest line, I have to say its the most impressive quest line I've seen, the fact that what you do in the quest affects the enviorment, and the changes are permananent, and the amount of lore is involved in just the first 10 minutes of the quests you do it astounding. Hell, once you log in you can get your first quest from Arthas Himself in front of you.
Professions now increased to 425 skill.
Death knights starting zone is a floating citadel in Eastern Plaguelands known as Ebon Hold, all the Naxxramas bosses are located there, and Naxxramas is being remade into a level 80 instance ( Rumor only, not yet confirmed ). Death knights can open a portal to Ebon Hold, just like a mage portal. The starting zone is a Sanctuary, and is an instanced zone.
NEW areas in Orgrimmar and Stormwind. Ever wondered about that Zepplin hanging over Orgrimmar? Well, it will take you to Northrend, including a new zepplin tower. Also featuring a new harbor being fixed in Stormwind that takes you to Northrend as well. Once you arrive in Northrend your plunged into the story and arrive in the middle of an epic battle at the outpost.
Critical strike rating, Hit rating , and Haste rating now apply to both Spells and Melee attacks, no longer different for casters and melee classes.
New Orgrimmar and Dalaran Arena. These arenas feature new interactive enviorment. ( Pillars rise and fall during battle, sewer water is spewed. Many random events during arena battles ).
Yes, flying mounts will be allowed in Outlands. A new feature is included as well, you will be able to take passengers on your flying mount as well. Though they will have to be unlocked at level 78 by a questline. Blizzard also introduced a Polar Bear land mount. They plan to increase the speed of flying mounts, though to what? We don't know at the moment.
Heres some info on WotLK Beta. I'll keep you updated if anything else becomes available. If you want to know detailed class changes visit the link located near the top of this post. Thanks and Enjoy
