It's not about 8K, I assume most of us want VRR , ALLM, QMS, QFT
HDMI FORUM VARIABLE REFRESH RATE (VRR)
Like AMD's FreeSync or NVIDIA's G-SYNC, the HDMI group has created their own version of the VESA Adaptive Sync protocol. We don't know much about their implementation yet, but it is expected to not be compatible with AMD's FreeSync. That being said, there is nothing stopping manufacturers from implementing both, as Samsung has already implemented FreeSync on some 2018 TVs and is expected to support both FreeSync and HDMI Forum VRR on some 2019 models.
Learn more about VRR
AUTO LOW LATENCY MODE
Another great feature created with gamers in mind, Auto Low Latency Mode (ALLM), also known as Auto Game Mode, allows supported TVs to automatically enable the TV's low latency 'Game' mode when it detects a game being played. This saves you the hassle of having to manually enable it each time you start playing. It even knows the difference between playing a game, watching a game on YouTube, or watching a movie, and automatically switches as needed. Again, Samsung was ahead of the pack with this feature, as some 2018 models already support it.
QUICK MEDIA SWITCHING (QMS)
In the past, whenever your device changed the parameters of the signal it was sending, like TV, the screen would go black for a few seconds while the TV adjusted to the new signal. This would be especially noticeable on game consoles, where the output refresh rate, and even the resolution, would sometimes change depending on the content. Quick media switching fixes this issue. When a compatible source is connected to a compatible display, the display will no longer display a black screen when switching formats, instead instantly switching between modes with no distracting black screen.
QUICK FRAME TRANSPORT (QFT)
Quick Frame Transport changes the way images are transferred from a source device to a display. Frames are transferred at a much higher rate, in order to reduce latency. Total input lag is a measure of many factors, including the time it takes the display to process the image and display it on screen. QFT won't completely eliminate input lag, but it will reduce the lag caused by the transfer time between the source and the display.