THQ today announced MX vs ATV Untamed for the Xbox 360, PlayStation 3, PlayStation 2, PSP, Nintendo Wii and Nintendo DS. Launching in January 2008, the game features bigger, more populated open-world environments, an X-cross career mode showcasing all eight vehicles and a new EnduroCross mode. The game is being developed with the Rhythm Racing physics engine with new improvements like throttle based power-slides, near upside down whips and new scrubs at full speed. Check the press release for more details.