Yesterday (8/7/12) Sony announced the release date for LittleBigPlanet Karting on the PlayStation 3. It will be available in North America on Tuesday, November 6th.
Along with the release date they gave us a glimpse at the game with a brand spanking new trailer.
For all you PlayStation Vita fans, you'll have to wait (maybe forever). I would sure like some official news on its potential release on the PlayStation Vita, but for now it's just rumors.