In an interview with the Tech Digest(approve sites) website, Sega Europe CEO Mike Hayes was asked about rumors of a comeback of the Dreamcast?. His reply was short and clear : "There are no plans for Dreamcast to make a comeback."
So there you have it. If DC fan's had any new hope after the great sales of Under Defeat, they can let it go now. But at least our beloved console is still alive after all these years!