Following rumors stemming from a GameStop listing, Sega has confirmed they'll be releasing a Dreamcast collection to retail before too long. Though no titles are confirmed for it yet, in the same breath, Sega's executive vice president of sales and marketing Alan Pritchard does mention Crazy Taxi (recently released digitally, along with Sonic Adventure).
"The Dreamcast fans are very devoted," he commented. "You see on eBay people are still buying the games and system. We actually have a Dreamcast collection coming out soon. We are looking to bring some of the old Dreamcast games to market digitally and packaged. The titles are still to be announced. The Ultimate Genesis Collection did huge numbers on PS3 and 360, so it's an important part of our business."
Space Channel 5 Part 2 and Sega Bass Fishing are next in line, so these are possible candidates as well.