GPE is how google thinks android should look and feel that's why you don't see any GPE nexus devices.......the only difference between a GPE and (let's use the s4) is that Google pushes out the updates to the phone Instead of Samsung or your carrier......GPE also have Vinnila android with googles tweeks...........so basicly its like making a GPE a nexus device
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Current Device: Samsung Galaxy SIII (SGH-I747)
ROM: Stock Touchwiz Rom
Kernel: Stock 3.0.31-2024954
Previous Devices: Motorola Droid 1, Pantech Crossover, Motorola Droid X, LG Revolution, Sony Ericsson Xperia Play (r800x)