LG is set to launch the G Flex tomorrow in Korea (for about $940), and according to this new video, the device actually flexes a little (you have to apply some force, though):
The G Flex has a 6" 720p RGB flexible OLED display made by LG Display. We know it is based on a plastic substrate, but it isn't known when it is covered in plastic or in a curved glass (like Samsung's Galaxy Round). If it flexes it makes sense this is an all-plastic device. But then it should have been "unbreakable" too, but LG never mentioned this in any PR so it is strange.
Other features of the G Flex include a 2.3Ghz Snapdragon S800 CPU, 2GB of RAM, 32GB of internal memory, a 13MP camera, NFC, Android 4.2.2 and a 3500mAh non-removable battery (LG Chem's curved battery). The G Flex has two rear-mounted buttons and a "self-healing" back (that will heal scratches quickly). LG is in talks with carriers to bring it to the US, Europe and Japan.