Sega Superstars racing or something like that. It's supposed to be a Diddy Kong Racing Sonic mod, and no Shadow, Knuckles, and Silver aren't in it because they're bad recolors. It is rumoured that "Project Needlemouse" is the next Sonic game, Sonic is in it, as for the other three, it is uncertain. Based on the teaser, it looks like it'll be a 2.5D game (3D graphics, 2D gameplay)