http://www.guru3d.com/news-story/amd-prepares-for-zen-clearing-inventory.html
http://wccftech.com/amd-zen-launching-ces-january-2017/
AMD will finally shipping Zen CPUs and X370 chipsets to OEMs and motherboards makers sometime in December 2016 but will it will missed out xmas sales. OEMs will be ready to start selling Zen desktops PCs when AMD will launch both Zen CPU and X370 chipset at CES 2017. Zen was original planned Q4 2016 launch for OEMs but now it pushed to Q1 2017.
We probably look at Spring 2017 for Zen to hit retailers as AMD are busy clearing CPU inventory, it is possible that it could take longer if AMD are in same situation with cleared excessive inventory of unsold Radeon 200 series GPUs for Radeon 300 series or write it off CPU inventory if they cant dump it.
We probably will have to wait until after CES 2017 to find out Summit Ridge benchmarks from OEMs or reviews.
AMD late again.