I have heard some complaints in-regard to possible upgrades of the original releases, but I would say that I can think of one if my favourites of the Dreamcast's titles; being Skies of Arcadia, had its bugs in its original form. Some spastic graphical issues at times, and one being a bug in the system that caused a random encounter every three-four steps. Also all of the DLC was lost with the dreamcasts ability to get online being pretty much senseless after a time. In researching I found that it is still actually possible, and private servers still exist to play a small list of games that had online support... but as stated-prior, pretty much senseless. (tangent, sorry) ...but in the Nintendo re-release of 'Skies' the DLC was recovered, and the bug was fixed, but sadly the "Pico" VMU minigame portion of the games was lost... which once I had played from Missouri to California and back in an RV on a trip with my grandparents, just to meet a girl I had met on a message board... (too much information) ...but somehow with Nintendos upgrades came the sacrifice of Pico, and the apprehension of my VMU and Dreamcast, came the loss of many hours spent racking-up an un-godly amount of extra items for Skies of Arcadia!!! ...but the real point in all of this is that maybe they could bring some new life into these old titles, like putting the best of Nintedo's update for Skies, and maybe finding a new way to instill the old Pico mini-game into the actual game itself.
I also heard Crazy-Taxi Mentioned, and honestly I think that maybe if it allowed for you to play the music you had on your hard-drive to play, that would make-up for any randow issues there is with the music changing. You could just listen to whatever you felt-like that way.
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...so essentially, I think we should just hope for the best. I know I am happy to hear that even some of these games are being talked about being revitalized. I do have a Dreamcast, but re-building that collection I had lost has proven to be pretty difficult, but the prospect of seeing them get a second chance, and possibley in a new and improved light is pretty exciting to me!