Its psosible A0 is not final revision and clocks? Example retails will be A1 nad about +200 MHz higher clocks? (so around 3GHz and up to 3500 MHz turbo) ?
I've heard from multiple sources that A0 is the current stepping. The CPU Lisa Su displayed at Computex was also A0 stepping. If AMD plans to release any Zeppelin based chips (regardless of the segment) prior the end of Q1 of 2017, then ZP-A0 is the final (major) stepping. Minor revisions (A0x, essentially hotfixes / workarounds) could be possible, but there is no way they can launch anything that has major changes in it prior that. In order to be able to ship any final silicon even on 31.12.2016, they must have completed all the validations of the silicon revision in question by the end of September (at latest). Since A0 is the current revision, there is no way to make & validate a new revision in just less than two months. So there are two options, either A0 is the stepping Zeppelin is going to launch on or the release will be postponed until the spring.
AMD has worked on Zen so long that I don't think they're able to squeeze much more out of it with a respin. I find the aging of the process to be much more potent way to increase the frequencies, in case of 14nm LPP. That obviously is not going to happen over night, but the improvements should be quite steady. That was the case with 32nm SHP and 28nm HPP at least.