We're likely a year away from the reveal of the Cadillac ATS, as the rumormill states that the rear-drive Caddy will likely go on sale in fall of 2012. We've seen plenty of spy photos of the sub-CTS Cadillac, as well, and now we've got a video that shows the entry-level ATS in motion.
The post-jump video, which comes courtesy of the folks at ATS Forums, appears to have been shot from the branch of a tree outside of General Motors' proving grounds in Milford, Michigan. It's difficult to see much in the video due to the heavy camo adorning the prototype, but we do see a more steeply raked windshield and a greenhouse that, compared to that of the CTS, appears to be a bit more rounded.
As an added bonus, the video shows a three second-long glimpse of the Buick Regal GS at the 1:34 mark. Hit the jump to take in the video for yourself. There may not be any audio, but there's plenty to see.