Sega will be releasing the Dreamcast classic Sonic Adventure 2 on PlayStation Network and Xbox Live Arcade in fall 2012. The confirmation comes from the publisher's Sonic Boom event, held last week at San Diego Comic-Con 2012 (via Joystiq).
The news follows a briefly posted product listing for an HD remake of Sonic Adventure 2 that appeared on Xbox.com in June. Sega never confirmed anything following the accidental reveal, but the product listing pointed to an October 3 release and leaderboard support for the game. Joystiq notes that the SDCC reveal made no mention of this being an HD remake, but we'll certainly be hearing more as the fall release draws closer.