The ESRB has rated several classic Sega titles for the Xbox 360 and PS3, which are presumed to be future XBLA or PSN releases. IGN
takes note that Gunstar Heroes, Phantasy Star II, Comix Zone
and Sonic The Hedgehog 3
are all listed, but there's no word on release dates. All these titles are currently available on the Wii's Virtual Console.
Assuming these sell for $5 each if they come to XBLA and PSN, Sonic's Ultimate Genesis Collection
, releasing in "spring 2009" for $30, seems the more frugal choice. The disc-based collection features all of the above titles -- with the exception of Gunstar Heroes
-- along with dozens more.