Sprint is testing a device from ZTE tentatively called the Quantum with model number N8910, Android Police learned recently. The Quantum has mid to high-end specs with its 5" 720p screen, a dual-core 1.5GHz Snapdragon S4, a 13MP camera, NFC, and Sprint's 4G LTE.
The device runs Android 4.1.2, which isn't currently the latest iteration of Android, but in line with most newer devices on the market today outside of the Nexus line and the Galaxy S4.
The lack of 2GB of RAM, 802.11ac Wi-Fi, and something like an S4 Pro (or newer) upgrade separate the Pro from the current flagships, but then again - did anyone really expect a ZTE phone on Sprint to suddenly blow everyone else out of the water?

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Exclusive: This Is The ZTE Quantum (N8910) Destined For Sprint was written by the awesome team at Android Police.