First Sonic Unleashed shots leaked (maybe)
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Here. There's no telling whether or not these are authentic, but they certainly look the part. These were apparently taken from a Sega FTP site but have now been removed, etc, etc. If someone "made these up", however, Sega should probably offer them a job.
No details on the game at all yet, if the game even exists. "Sonic Unleashed" was trademarked by Sega recently.