Err I honestly don't know I should've made a new thread for this instead, but...
1- Sonic Generations on PC is the best version, so either get it on that or double dip.
2- Sonic CD is coming to Steam, I think the price is $10
3- The sequel to Sonic and SEGA All-Stars Racing was announced and hopefully it looks to be an improvement on the first game. It will be on 30 FPS however.
It will follow a format/concept similar to Diddy Kong Racing...however that played @_@.
Confirmed characters include Ryo Hazuki and Vyse from Skies of Arcadia. There is also a Panzer Dragoon stage, and apprently the team is hinting at
EDIT: Oh and feel free to ask about Sonic comics, they have been great these past few years~