From what i have seen and heard, Priest and Druid HoTs (Healing over Time) stack, which you could have like 10 HoTs on at a time etc.
Blood Elves have the normal pointless racials, but their Active racial, there are two stages. The first one is called Mana Tap, and you can siphon mana from your target, this stacks on you up to 3 times. Then, you use Arcane Torrent to release the Mana, granting you extra Mana/Energy depending on the number of charges. It also is a brief AoE silence which I have seen has been nice in PvP.
Flying mounts will cost 1000g for the "normal" flying mount that moves at normal run speed (yes, i know, BS), and 5000g for the epic flying mount that moves at 160% run speed. There's a definite increase in gold, particularly from quests (Ive had quests reward me with 17g so far) and vendor trash.
Draenei ride the Elekk, which is an elephant type beast (Which you all should know by now). Blood Elves ride Hawkstriders, which are like Chocobos from Final Fantasy, but rainbow-colored.
Gold drops have been increased, not too much tho, especially gray vendor trash, and quests have had up to 17g rewards.