From what I have been able to cobble together, the Vizio lineup will pretty much be:
mostly 1080p with built in apps and traditional remote
4k, basic remote, Chromecast that is used with your smartphone
4k, HDR, basic remote plus tablet remote for use with Chromecast
4K, HDR, Ultra color spectrum, basic remote plus tablet remote for use with Chromecast
R-Series add 5.1 audio system and a lot of money.
As you move up in the lines, you also gain more local dimming zones although there is some gray area between the D and E series.