A French gamer's shown a listing from Jet Set Radio on XBLA, as reported by Destructoid.
The screen lists the cel-shaded rollerblading game as having a demo, but nothing else.
Dreamcast XBLA games have been persistently rumoured for years, again being mooted last week as Sega laid off over 70 staff and refocused its US operations on downloadable content.
The original JSR was announced in 1999 and released in 2000. It was one of the first cel-shaded console games and was a "cool" kid favourite.
This could be a proper load of bollocks, obviously. We'll ask Sega later this morning.