The Techbench stuff will be available soon, probably when or just after 20150 is released on IP WU, in about 2h45m.
I think maybe 20H2 will have most features which mn_release added. I don't know what the next step of 20H2.
19H2 has only few features of of 19H1. BTW, I think MS made good choice to change version with 20H2 and 21H1 and more, because 2009, 2103 was confused.
Does anyone know if it will be possible to move a machine on this to slow ring (beta channel) to get 20h2? Like they did with 19h2.
If you are on 20H1 19041.330: OfflineInsiderEnroll by @whatever127 OfflineInsiderEnroll Enroll in slow and you will get the 20H2 EP offered.