The post claims that the videos are of a game loosely titled “Perfect World Mastered Version” and that it will be a “fast-paced action combat game” made in Unreal Engine 4. Apparently, the game will utilize QTEs for combos and it will support game devices.
No other information is avilable on the game at this time, but you can get a peek at some leaked videos below. Keep in mind that since they’re leaks, they’re not the best quality. (And, no, I’m not sure why some of the characters heads are blurred out.)