The leak indicates the Nexus 10 will be running Android 4.2 out the box. Other specs include a 2560 x 1600 (Super AMOLED?) screen, a cortex A15 dual-core 1.7ghz Exynos 5250 CPU/Mali-604 GPU combo, 2GB of ram, 16GB of internal memory, a 5MP rear camera, NFC/WiFi, and Bluetooth 4.0. As with all Nexus products the N10 does not have an SD card slot.
As predicted the Exynos 5250 CPU/Mali-604 GPU combo is the same one used in Google and Samsung's new Chromebook and is the first cortex A15 chip in a tablet or smart phone.
The screen also falls in line with previous rumors and gives the Nexus 10 the highest PPI of any tablet on the market at 299. This compares favorably with the current market leading iPad which has a PPI of 264.
No word on pricing yet, but Google's October 29th event can't get here soon enough!
More pictures of the front, back, and profile: