Seems like the Ninty exclusive deal is finally gone, Sonic: Lost World is coming to Steam for the PC Master Race on November 2, 2015. You can preorder the game now at Steam. SEGA did make extra work for this release by adding the following:
- 60 FPS gameplay
- HD resolution support
- Full PC Gamepad + Keyboard support
- Full Steam functionality
- NiGHTs Into Dreams Stage
As a bonus, you’ll receive a Sonic & All-Stars Racing Transformed Steam copy if you preorder the game.