Let them get Karting squared, stable and ready. They already had a hard time keeping Karting stable on the PS3 in the beta, Vita would be an absolute mess if tried to make a Vita version at the same time they try to get the PS3 version up. A bigger mess LBP PSP was to LBP1. I'd be surprised if they didn't release a Vita version, but its way too early.
Little King of LBP Level Recordings http://www.youtube.com/user/JHKthree