See Sonic 4's Splash Hill Zone, Eggman
For those of you who have yet to decide to boycottSonic the Hedgehog 4, Sega has released some new media of the downloadable rodent-racing platformer. Including ... the second known character to appear in the game. Okay, before more of you start boycotting, it's just Eggman (or Dr. Robotnik, or whatever). And he's shown in one of his spheroid flying vehicles, implying that he's in the game in boss capacity only.
The site also features a few screens, music and a description of Splash Hill Zone, which can be summed up as "Green Hill Zone in HD." And that's a good thing, right?
