http://www.wow.com/2010/04/15/celestial-steed-lil-xt-now-active-on-the-blizzard-store/
There's a queue
http://www.wow.com/2010/04/15/queue-for-celestrial-steed-and-lil-xt-is-above-70-000/
If you are curious about the Celestial Mount and the robot pet, there are videos here.
http://birdfall.blogspot.com/2010/04/celestial-steed-buyable.html
UPDATE: My favorite comment about Blizzard's selling of digital items is at the link below. I believe folks aren't complaining about buying such expensive digital items now because kids are overrunning WOW. Thoughtful adults are not purchasing such things, especially in such a down economy, but there are few adults left playing the game.
http://www.massively.com/2010/04/16/anti-aliased-shut-up-people-come-buy-my-horse/#comments
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