A listing for Sonic Adventure 2 briefly popped up on Xbox.com today, before quickly being taken down.
Luckily, NeoGaf user Kokonoe grabbed a screen of the Dreamcast title's information before it was removed. As the listing says, the game is expected to launch in October, and will feature leaderboards, offline multiplayer and content downloads.This is likely to be a HD port available on both XBLA and PSN, although details are yet to be confirmed.