They are Sega Bass Fishing and Space Channel 5 Part 2. JeuxVideo24 have screenshots of how they will look on the new consoles in 720p and widescreen.
Space Channel 5 Part 2 is an interesting choice. before you ask where part 1 is, I believe they've picked this one simply because it's easier to port. Part 1 one used pre-rendered video backgrounds (as opposed to in-game graphics like in Part 2) so not only would they need to re-render those videos in HD, they would either have to stretch them or force the game to be 4:3 (like the Sonic Adventure port was). Maybe this is why they have skipped to Part 2. To be fair though Part 2 is a much rarer game, especially on Dreamcast on which it would cost you a small fortune, especially if you went after the special edition box set.
Sega Bass Fishing is.not quite so exciting. The game really required the fishing controller to have much fun with it so wherever they will implement the Move controller for the PS3 version is yet to be seen, but very unlikely. Hopefully Sega marine Fishing will follow up eventually from this, as that was a much more fun and bigger game.
In case you were not aware, Crazy Taxi is due out at the end of November so at this rate it looks as though we may be getting a Dreamcast port every month if one of these is due in December.