Streets of Rage 1&2 should be a lock. Going by the tape SEGA sent me, we can at least look forward to Space Harrier, Outrun, Super Hang-On, Shining Force 2, Columns, Vectorman, Golden Axe, and G-LOC Air Battle. I'm sure the usual suspects like Streets of Rage, Gunstar Heroes, and so on will be coming, too.
Golden Axe I-III more Phantasy Star series games and Shining Force for sure
also these revenge of Shinobi, King Colossus (since it never got an official outside Japan release), outrunners, dragon crystal, and dragon force