I've seen it stated that if you buy the PS3 version you get the vita version free. I really don't know why ppl expect it differently. I never heard of a deal like that were you can buy the cheap one and get the more expensive one free.
http://blog.us.playstation.com/2012/08/14/playstation-all-stars-gamescom-reveal-dante-sackboy-spike-ratchet-and-clank/ they say it in the last part right above the char pics.