It seems that Carrier AT & T, Sprint and T-mobile are ready to release the G Flex in the US in not long future.
The device, known as the LG D950, supports LTE bands 2, 4, 5, 7 and 17, as well as the GSM 850/1900 frequencies- which means it should work on the AT&T network.
The FCC approvals suggests that the AT & T will launch this G flex soon.
LG G Flex FCC Approve Date:
T-mobile (LG D959 ) 2013/11/15
Sprint (LG LS995) 2013/11/20
AT & T (LG D950) 2013/11/22
There are no words yet if Verizon will launch this G Flex.