Six registered domain names could possibly point to a new Sonic Adventure 3 game.
The following domains were registered on the 22nd of April: sonicadventure3.com, sonicadventure3.net, sonicadventure3.org, sonicadventure3.info, sonicadventure3.fr and sonicadventure3.eu.
It remains unknown who the owner is.
The first two games in the Sonic adventure franchise were released on the Dreamcast. Recently it was announced that Sonic Adventure 2 would be brought back in HD on Xbox LIVE and Playstation 3 this autumn.
Although Sega hasn't officially announced a third title in the series, there's always room for speculation.