The HDMI forum has published the specs for version 2.1 and give gamers and multimedia perfectionists everything they could ever want for years to come. Many, many years. 4K, 8K and even 10K video streams can be pushed up to 120fps (with the new Display Stream Compression). Without compression, the maximum is 8K/60 and 4K/120. It will be a long while before broadcast TV (even movie studios) adopt 8K, but these will be awesome for VR gaming... though they'll require beastly GPUs. Another cool feature for gamers is Variable Refresh Rate - think AMD FreeSync or Nvidia G-Sync. Quick...
Source: https://www.gsmarena.com/hdmi_21_detailed_up_to_10k_resolution-news-28496.php
