www.makemkv.com

I ran across this: https://www.matroska.org/technical/menu.html
I'm taking this to mean that its being looked into to add DVD, Bluray and UHD menus with MKV files. If this is true, how close to implementation is this? Any info on it at all? Thanks!

I feel pretty confident that regardless of what the MKV format itself supports, MakeMKV is incredibly unlikely to ever support this feature.