Sega is set to begin the second round of downloadable "vintage" games, starting with XBLA's Gunstar Heroes on June 10, with the PSN version hitting the following day. Gunstar Heroes appears to be the only title planned for the PSN from the seven announced titles.
Although the seven games have been "re-worked" for high-definition, with online leaderboards and network play, it's worth mentioning that many of the titles are also available on Sonic's Ultimate Genesis Collection.