The Barnes & Noble BNTV800 showed up in GFX Bench and it appears to feature a 1620x1020 screen and a Tegra 4 processor. We are still not sure about the size, but given the resolution and designation it appears to be an 8-incher.
The device was running Android 4.2.2 when it was benched, although it is unclear whether it will launch with 4.2.2 or a newer version of Android.
You can check out the details at GFX Bench.