Via WorthPlaying
Earlier this month it was revealed that SEGA put down a new trademark for Sonic Unleashed, what looked like a new installment in the Sonic franchise. While there has yet to be any official announcement some sneaky forum fellas seemed to have stumbled upon a "SEGA ftp" and leaked a boatload of screens, and also a trailer on YouTube.
Click on the link here or the "Via" link about the post to see the screenshots.