Wow, I did some searching and the first thing that came up was this same question asked by you on Joystiq, haha. Here was the answer that they provided -
Black elekks and hawkstriders weren't
available until a few patches into
Burning Crusade, so if we're getting a
PvP version of the goblin trike, it
may not be for a while yet.
I would venture to say that the response given above is accurate and Blizzard will more than likely produce such mounts in the war form by speculation from past history. They've successfully managed to bring in the elekks and hawkstriders, so it seems only fitting that they would bring in war mounts for the new races as well.