I think this was confirmed ages ago but incase you didn't know. Vita can be used as a PS3 controller with the Vita's touchscreens sometimes gaining extra functionalities.
The first game out of the blocks to use this feature will be LBP2 in the form of a DLC
So...who wants to be the first to accuse Sony of copying Nintendo, which is undoubtably what this will decsend into.
Thanks to OPM_Uk