Here's the word:

It’s official! On November 17th, 2009, you’ll be able to take Sackboy on a completely new adventure. LittleBigPlanet (PSP) hits the store shelves and now you’ll be able to Play, Create, Share…everywhere. (We know you know, but there may be others out there…)

Gonna be honest here.  I loved LittleBigPlanet on PS3, but not excited at all for a PSP version.  I only own 1 PSP, so I can't play with anyone else in my house....and that kills it for me.  I really would have liked to see them work on a 2nd game for PS3.