There. You can see it above. Reportedly this ad for an upcoming black Xbox 360 "Slim" (doesn't look that slim) popped up on Italian gaming website Console Tribe. It has since been taken down, but the internet is faster than that and grabbed a shot of it.
The ad said the new 360 would have a 250GB HDD, built-in WiFi (it's a miracle!) , and compatibility with "Kinect." The general assumption, which could be 100 percent wrong, is that Kinect is the actual name of Project Natal. Some digging through the source of Console Tribe shows that Microsoft owned ad company Atlas Solutions pushed the ad and image automatically to the site. The ad linked back to Microsoft's Italian page.
Video of the ad in action below.