Adding
<uses-feature android:name="android.hardware.camera" android:required="false" />
to the manifest file (although i wouldn't, because actually camera is required), 56 devices were added to the supported devices list, included two more Nexus 7, now they are:
GoogleNexus 7– grouper
Nexus 7
GoogleNexus 7– tilapia
GoogleNexus 7– deb
GoogleNexus 7– flo
I deduce that deb and flo are the new ones, with back camera, and old ones (v2012) are grouper and tilapia, i don't know about the ones labeled "Nexus 7" only.