Starting tomorrow on both the PS3 and PlayStation Vita, the upcoming PlayStation All-Stars: Battle Royale will be playable through a limited public beta test.
If you want to play the beta on your PS3, you're going to need to do one of two things: Either be a PlayStation Plus subscriber to get early access tomorrow, or wait a week when it goes completely public.
For the PlayStation Vita, being one of the poor schmucks early adopters nets you early access with or without PlayStation Plus.
The most interesting aspect of this beta is the fact that it supports Cross-Play, letting PS Vita owners play against PS3 owners.
Six characters in total will be playable across two different stages and two modes.
[Source]