The lights are on
I hope that title isn't misleading, because I'm going to go ahead and assume that Sega refers to Robotnik as "Eggman" in Sonic Generations. However, the dude's name is Dr. Robotnik, and that's the guy I see in this new boss-centric trailer for the upcoming title.
In addition to the rotund doctor, you'll also catch glimpses of Metal Sonic, that crazy water boss from Sonic Adventure, and what appears to be a new menace in the form of a demonic purple cloud. I'm sure it'll all make perfect sense when the game releases on November 1st.