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a.k.a. "Rouge" is either gonna be a random G.U.N. human or wont appear and Sonic 4 will star a new director that Is not afraid of bat tits, and overall the movies might change to animated style thanks to the success of recent Paramount animated projects, allowing more fantasy settings from the games, (Stages, emerald Stages, planeta, cities with furry people, etc.) just like how Transformers One features a storyline that fully happens on Cybertron, which was impossible to achieve in the previous live action universe
Also you can only play with a few villians before it starts feeling boring without Eggman, and this is Jim's (almost) last film before retirement