AMD has officially confirmed that they will launch Ryzen 2000 in April 2018.
Here are release dates:
Ryzen 3 Mobile APUs: January 9th
Ryzen Desktop APUs: February 12th
Second Generation Ryzen Desktop Processors: April.
Ryzen Pro Mobile APUs: Q2 2018
Second Generation Threadripper Processors: 2H 2018
Second Generation Ryzen Pro Desktop Processors: 2H 2018
They are implementing new technology called Precision Boost 2 and Extended Frequency Range 2.0 ( XFR )
There are some benchmarks: