They've already released:
- Andro Dunos (plus made a sequel)
Bang Bang Busters
Breakers
Captain Tomaday
Ganryu
Goal! Goal! Goal!
Puzzle de Pon!
Neo Drift Out: New Technology
Neo Mr. Do!
Battle Flip Shot
Puzzle de Pon! R
Breakers Revenge
Bang Bead
Koi Koi Mahjong
Nothing outstanding but some half decent titles in there.
Personally, assuming they sort the emulation out, I'd love to see Neo Drift Out: New Technology as I played it a fair amount. Maybe a compilation disk with say Goal! Goal! Goal! and Battle Flip Shot and say Puzzle de Pon.
Obviously the other debate is that you can already run these on a Dreamcast via emulation etc however I do like having proper releases with nice manuals etc