Playstation All-stars Battle Royale: full roster revealed!

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VicViper said:

I could bet 20 dollars with anyone saying there won't be secret characters.

Not saying it's going to be Cloud or something huge... but it's plain obvious there'll be at least 5.
Seriously, guys - just think about it, what fighter does not have that, it's a major part of the fun, especially in nostalgic games like this one. And there's even "evidence" to support this.

The trend in many fighting games has been to have every character unlocked from the start for online play.  I can't say that this is the case here, but it's not a guaranteed that there will be unlockables.