AMD motherboard partners have revealed that the planned launch for the new 12nm version of Ryzen is in February 2018, with 400-series motherboards to follow. AMD has seen large increases in revenue in 2017 and expects to account for 30 percent of the desktop CPU revenue in the first half of 2018.
https://www.notebookcheck.net/Motherboard-manufacturers-claim-the-new-12nm-Ryzen-will-arrive-in-February-2018.251736.0.html