check out the cover here, followed by part one with issue 226 and part two in issue 227. The four part arc, continuing in issues 228 and 229, looks to be paying homage to the four original Genesis games. However how Sonic and friends enter those classics has yet to be revealed. All that has been said is that somebody's life (probably a SatAM character) depends on the outcome of the Genesis arc. I could care less who dies, as long as we're getting more awesome artwork from Spaz!
After the beak, check out a preview page from Sonic: Genesis!