Two photos taken with a Nexus 7 built by Asus have appeared on Picasa Web Albums. The 1280 x 960 images (which may have been scaled down) were taken on June 7th and June 13th and are attached to Google+ user Somit Bh. According to the Google+ geo-location data they were taken in Google Building 44. While it's easy to fake all of this data, a number of people seemingly affiliated with Google can be found in Somit Bh's Google+ Circles, which implies the images could be legitimate. The Nexus S was revealed in an identical manner just two years ago.
The "Nexus Tablet" has long been rumored, and over the past months we've been hearing reports that Asus is in line to make it. We broke the news in April that an Asus-built tablet would go on sale this July for between $149 and $199, and with Google IO around the corner, we expect to hear an official announcement soon.