Zul'Gurub will be removed, taking the tiger and raptor mounts. Considering they quickly found a new home for the rare drop pet and already have a new home for Polymorph: Turtle, I still have hope for these mounts coming back.
The Green Proto-Drake that drops out of the Oracle's revered-required Cracked Egg is now easier to get. The egg cracks after 3 days (down from 7) and the droprate for the mount has increased. ^_^
Mounts you got by beating super-hard-mode bosses are now a rare drop on their 25-mans.
Cute and Functional
New race/class combos such as night elf mage, tauren paladin, etc.
Time to go to work.