Almost no chance considering betas usually exist to stretch the server limits. Fighting games often have something different than servers. Also due to who the fighters are it's not exactly getting an arcade release.
I'd say there's a decent chance of a single player demo but probably less than a month before release.
On the one hand, it'd be nice to have a beta just to test out the potential of the game but on the other, if the beta ends up being bad, broken or glitchy as such, there are certain people who might misunderstand the definition of a beta, thinking it's going to resemble the full game and thus, the game could well lose in sales and hype.
Suddenly, I don't feel like the beta is a good idea.
Fun Fact: Fanbases are 100% unpleasable. Deal with it. Official Fat Princess of the PSABR board.