Hey, you. Yeah, you with the fancy curvaceous phone. Stop showing off that flexible frame and self-healing back, and check your settings menu. According to AT&T's blog, the LG G Flex is being updated to Android 4.4 as of today. Huzzah, excelsior, and general rejoicing abound. At least a few users over at XDA have already received the over-the-air update.
Credit: XDA user hands0m3. Ignore the carrier text - the model number (D950) matches AT&T.