Yeah, well it isn’t. Yet.
“We’re still thinking about it and haven’t announced a PS3 version, so we can’t say more about it just yet,” producer Jun Takeuchi told Gamesradar.
Takeuchi explained the reasoning about revealing the game on Live.
“We wanted to show the game first and foremost to fans of the original Lost Planet,” he added.
“We talked to Microsoft about doing it this way and they were interested in it as well. Also, I think it was a unique and memorable way to announce the game.”
There’s a full interview through there.