AMD has never really said that it will ship the Zen this year, the company was always cautious about giving  the exact date of the launch. We still believe that the desktop version of Zen will get shown late this year, December or at CES, in the first days of next year. Bench-life thinks that the actual shipping will happen in February. 

The latest information mentions three different chipsets - the X370 high end chipset and the B350 and A320. The B probably stands for Business platform, a market that AMD is eager to re-enter to and of course the A320 should offer a more affordable Zen based computer.