It's straight forward, they haven't made it available to the public yet. But when it goes LIVE, you vote between the 2 characters presented on who would win. As suggested by the Bane vs Catwoman, voting closes Thursday, and possibly Friday, an actual in- game match will be released being played by elite players from the FGC, as they play those two characters to see who wins. The vote may say Bane will win, but what if Catwoman wins in the actual in game match because she is being playing by someone like ChrisG?