The fact that AMD Zen "meets all expectations" got us excited until we looked a bit deeper. It turns out that the report is based on a guy who swears he knows a guy that use to work for AMD on K12 L2 cache design. It is not clear if he met the guy in a pub or not.
His other colleague that still works there tells him that the test chip has meet all of the expectations and the team didn't find any significant bottlenecks and this got the partners on the server side very excited. We have had our share of AMD Zen exclusive news, but it will take a while until this chip hits the market, we expect it in late 2016. 
At the stage of development AMD should actually be in the end phase anyway and if everything went fine, the test chip should be running. The last few quarters are  used to further optimise the design.