For example, if SupeBot's facebook page gets a certain amount of likes then they will add a character to the beta.
5000 likes for Nathan Drake
10,000 likes for Big Daddy
Or something like that of nature, doesn't have to be facebook, could be twitter, but something like that would be cool imo. I know it's not gonna happen, just a thought.
that actually sounds like a good idea, id make a facebook just for that
prince of Persia moveset: http://community.us.playstation.com/t5/PlayStation-All-Stars-Battle/Prince-of-Persia-in-all-stars/m-p/38273897#M125640