Anandtech published Early AMD Zen Server CPU and Motherboard Details: Codename ?Naples?, 32-cores, Dual Socket Platforms, Q2 2017 A quote from the article:

At the AMD Zen microarchitecture announcement event yesterday, the lid was lifted on some of the details of AMD's server platform. The 32-core CPU, codename Naples, will feature simultaneous multithreading similar to the desktop platform we wrote about earlier, allowing for 64 threads per processor. Thus, in a dual socket system, up to 128 threads will be available. These development systems are currently in the hands of select AMD partners for qualification and development.

AMD was clear that we will expect to hear more over the coming months (SuperComputing 2016 is in November 2016, International SuperComputing is in June 2017) with a current schedule to start providing servers in Q2 2017.

 Early AMD Zen Server CPU and Motherboard Details: Codename ?Naples?, 32-cores, Dual Socket Platforms, Q2 2017 @ Anandtech