Google's Own Tablet?

Following last week's announcement from Microsoft that they were releasing their own tablet (The Surface), Gizmodo Australia is reporting that Google is going to be announcing their own tablet, The Nexus 7, this Wednesday at their Google I/O conference.
While there are dozens of different Android based tablets out there they are customized by each manufacturer. The Nexus 7 will be the first one created by Google with their Android software in it's purest form (just like their line of Nexus Android phones).  These rumours have been swirling around for months so who know if it's true, but here are few of the rumoured specs
Cost: $199 (8GB), $249 (16GB)
Size: 7 inches
OS: Jelly Bean (Android ver. 4.1 or 5?)
CPU: Tegra 3, GeForce 12-core with 1GB of RAM
Battery Life: 9 hours
Release Date: July 2012