is indeed being added to World of Warcraft with the arrival of Warlords of Draenor. Those of you who watched Azeroth Choppers from start to finish might have been surprised at the whole idea of only one bike design seeing implementation, but odds are you (and pretty much everyone else) saw this coming.
Worth noting, however, is that the chopper will cost money and will be available only to Alliance players. By contrast, the Horde chopper will be given away for free to players who log in before September 30th. Since it will not be possible for the opposite faction to ride a given chopper, this does mean that the Alliance version will end up being something of a gold sink for Alliance-only players. But, hey, you're getting it in the game; isn't that the important part?