Swore I saw someone say the other day on here that Zen+ would be compatibly with X399? I thought Zen+ was for the AM4 platform?
Zen+ and Zen2 are the same thing.
Zen is the architecture name (name of the processor core technology).
Ryzen or AM4 is the mainstream version of Zen.
Threadripper or X399 is the enthusiast version of Zen (which is 2 Ryzen's bolted together via their infinity fabric technology).
Zen+ or Zen 2 will both be coming to both platforms, as it's just the next arch in a line of Zen upgrades. It should first appear on GloFo's 7nm process towards the end of next year, likely coming on AM4 first, then X399 a couple of months later (just like with Ryzen and Threadripper).
Hope that clears up any confusion with all the names.