From what I can, and what do I know really, is that the back doesn't look nearly as glossy as the Nexus 4. That would lead me to believe it's not a glass rear panel, it looks more like rubber or plastic. Though I could be way off.
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Current Devices: Nexus 5, Asus TF700, Google Glass, (2013) LTE Nexus 7, Logitech Revue, Chromecast
Retired: Samsung Fascinate, Droid Charge, Galaxy Nexus, (2012) WiFi Nexus 7, Nexus 4