A small Dutch SEGA fan site recently got a anonymous tip which told them Sonic Adventure was heading to X-box Live Arcade. To back it up a image was sent to them as well, which can be seen after the jump. The image shows listings for the demo, the full game, and a “Extend Package” for the title.
SEGA of Europe quickly swatted it down though with the website deleting the article leaving behind “This message has been deleted on request of SEGA Europe.”
We also know that SEGA was talking to Sony about bringing back Dreamcast classics to the PSN service while also offering them a choice of exclusive titles. This would suggest they would be talking to Microsoft about bringing Dreamcast titles over as well.