The LG Optimus GK is like the LG Optimus G Pro, but with a 5 inch screen
VR Panorama, which helps users stitch together a series of photos into one panoramic shot. Dual Camera, which allows for the use of the front and rear camera at the same time, is another feature found on both LG phones. And both models offer Smart Video, which uses the front-facing camera to determine if the person using the phone is still watching a video on the device's screen. Once the camera "sees" that there are no eyes on the screen, the video is paused.
So far, LG has not announced a launch date or a price for the LG Optimus GK.
source: LG (translated) via AndroidCentral