You may or may not heard of Mashed, but basically it came out for the PS2 and Xbox, sold fairly well, then was followed by an expansion pack of sorts called Mashed:Fully Loaded. In short terms it's often considered the most addictive mutliplayer racing game, and with many fans loving the series and demanding a sequel, Supersonic have 'officialy' announced a sequel, GAS, for XBLA and PSN.
Here's their blog: http://www.supersonic-ftp.co.uk/wordpress/
Here's their blog: http://www.supersonic-ftp.co.uk/wordpress/