You will still need additional h/w for HDR signal processing, HDMI by itself won't (and shouldn't really) be able to handle this. You will need it just because you'd still want to support Dolby Vision (or some other HDR standard) for example which isn't a part of HDMI spec and never will be. "VRR" is what's called Adaptive Sync in VESA specification for Display Port 1.2a+ and it's essentially the same thing which FreeSync is built upon. The big question still is how HDMI will handle the spec as requiring all HDMI devices to support adaptive sync may be a bit extreme (not all devices need this) so it may end up the same as VESA's Adaptive Sync in DP - as in an optional extension which you may use or not. In that case it will be pretty much the same as it is now with FreeSync and G-Sync, the biggest difference would be that TVs and consoles would get such support and that may push NV to supporting it in addition to their own more advanced G-Sync.