According to this article it looks like there will be dual socket motherboards for Zen servers:
http://www.anandtech.com/show/10581/early-amd-zen-server-cpu-and-motherboard-details-codename-naples-32cores-dual-socket-platforms-q2-2017
As CountMike said though, this motherboard is only for AMD's server lineup, it is very unlikely that we are going to see a consumer board with dual socket. If you are confused about the name Zen, it is a carpet name for all new AMD CPU's that are being being on their new 14nm architecture. So far we don't have official confirmation on what AMD is naming their Zen chips because nothing has come out. Think of it as Intel's designations for their CPU's, Xeon is for servers, i7 for high end enthusiast chips, i5 for performance, etc. Because no Zen CPU has been officially released, we just end up calling them all Zen, from server to low end, Zen.