Fudzilla posted AMD demonstrates Zen running Doom
A quote from the article:
AMD has released a short video where its lead system engineer Louis Castro running Doom on its Summit Ridge, Zen-based processor .AMD demonstrates Zen running Doom @ Fudzilla
This means that the silicon is in good shape and the processor was taped our probably late last year with no major issues. AMD's CEO Lisa Su has already said that the desktop version shall arrive first, and this was the CPU demonstrated in the video.