According to the source LG G flex has 6 inch display. The G flex also contains rear-mounted buttons in a similar style to the LG G2's with the camera of 13 megapixels. And last but not the least an OLED flexible display technology which is used to curved the screen from top to bottom.
LG G Flex is yet to be officially announced and it is said to be launched in South Korea next month. Although there is no release planned for the US, Europe, or Latin America yet but they will contact the company's Argentinian office to confirm if it is "the real thing.