AMD just released the 2018 roadmap for Ryzen, to be clear there is no Zen2 architecture on sight.

According to the roadmap, new Ryzen 1.5 desktop CPUs (as I like to call them) are planned to launch in late Q1 2018 together with new Ryzen 3 APUs for mobile and, close to them, Ryzen PRO APUs for Business oriented mobile devices.

As said we are not talking about Zen2 but of Zen+, almost as Zen but with a refined 12nm manufacture process and we still don't know the new codenames (probably Ryzen 2X00).

The new CPUs will be called Pinnacle Ridge for desktop parts and Raven Ridge for APUs.