Since yesterday, SEGA bought a domain name under soniclostworld.com (IIRC?) and when the new Nintendo Direct went live, the game itself was announced.
Here's the teaser image we got from Nintendo Direct:
The only other interesting news was:
So yeah, this title will probably be skipped by some of us. There isn't any release date announced yet either, so the game's probably still in early development.Originally Posted by Sonic Retro
Anyways, feel free to state whatever your expectations and opinions are for the game as of right now.