Sony has released the RX0 Mark II which now includes the ability to record 4k internally as opposed to using an external recorder. Other goodies include a new flippy screen which while tiny, it allows for easy framing and selfie vlogger styles. A new stabilizer is included for reducing shake and it is a definite improvement even when the rolling shutter is a real problem.
Most of the camera is the same as before when it comes to body shape and usability, the higher frame rates are identical as the 2017 RX0 Mark I with essentially the same resolution and time recording. The big improvement comes in the screen and internal 4k recording with stabilization which seems to be directly aimed at vloggers. The sensor is, however, a tad less crowded by pixels at 15.3MP on the Mark II vs 21MP on the Mark 1. That should help in the low light department.