Not to mention Anarchy Reigns, which they could also borrow ideas from. Better to have people compare it to Power Stone and a PG title than a Nintendo title. Not to mention Fighters Megamix.
Ideally, they'd rerelease Fighters Megamix first and tout it as the ORIGINAL multi-franchise fighter, making some sly digs at Smash Bros and PS All-Stars. Then announce a SEGA fighter with Power Stone and Anarchy Reigns similarities. Killing two complaints right there about being a Smash Bros ripoff. Also, the title would just HAVE to have Megamix in the title. It's a no-brainer. "Sonic & All-Stars Fighters Megamix" or something to that effect.
Warzone is such a shitty subtitle, doesn't even sound like a SEGA game. Sounds more like a FPS title.