Codenamed MB886 on the official FCC paperwork, the device features LTE band for AT&T (LTE Band 4 -screen shot of the document below) and uses the same naming convention as the two previous models, according to Engadget.
There are not many specifications in the FCC document except for the connectivity, we now know that the smartphone will support WCDMA/ HSPA+, GPRS, EDGE and LTE. Rumors tell us that it will be powered by an LTE-compatible Snapdragon S4 processor and a 720p display.