Now, just because they promise 200 characters, doesn’t mean there will be 200 playable characters. It just means there will be a ton of cameos, some will be villains others NPCs. If you haven’t heard about Project X Zone, it will feature characters from SEGA, Namco-Bandai and Capcom in a tactical RPG on the Nintendo 3DS.
I know what you are saying, “When is the game out?” Sadly, the game hasn’t been announced for release outside of Japan and I doubt it will make its way out of there. Namco x Capcom on the PS2 stayed Japan exclusive as well.