I can't belive people are actually complainig blood elves are horde. I mean..first.. WC3 sucked.. it isn't even a real rpg. WoW contains a buttload more compleate lore and timelines then wc3 can shake a stick at. So if ANYONE has a right to write new lore, it is WoW.
Second, Alliance has night elves, I think MORE people would complain if we got blood elves, "oh gee big whoop.. we get ANOTHER elven race.. heck its even the same model.. and look at horde, they get something totaly new!", I sure as hell would!.
A new race is just fine.. kunark was one of the best expansions for eq and it only featured an added race, no new classes.
I think this expansions look bad ass, and am very excited, though blizzard has a track record of letting people down too, I doubt everything will come out as planned.