The chips aren't officially out yet, but overclockers are already setting world records with the new AMD Ryzen 2000 series. TSAIK overclocked the AMD Ryzen 7 2700X to 5884.24MHz and a Ryzen 5 2600X to 5882.97MHz.
It will be interesting to see how high overclockers can get the second-gen Ryzen chips. For comparison, the current world record for a first-gen Ryzen stands at 5905MHz, for the Ryzen 5 1600X:
The highest clock achieved and verified by HWBot is 5905 MHz on Ryzen 5 1600X. The highest frequency for Ryzen 7 1800X is 5803 MHz. Both records were broken by der8auer.