The current Ryzen series was codenamed "Summit Ridge" and TweakTown just found out that the Zen 2 architecture is codenamed "Pinnacle Ridge". AMD promises this architecture will deliver up to 15 percent gains in IPC, you can probably expect the first Pinnacle Ridge CPUs in 2018.
AMD's new AM4 socket, that takes Ryzen, will take Zen 2 and Zen 3 processors in the future. Better yet, we're looking at up to 65% more IPC improvements over the older Excavator CPU architecture, with the aim of Zen 2 and 3 featuring support for higher clocked DDR4 RAM and lower CPU clock speeds. AMD will continue to nail the 14nm FinFET process, so we should expect the nodes to continue with better yields, and chips that have higher default clock speeds thanks to the refinements along the way.