Why not go and talk to the market and OEMs and see if something like Skybridge is a good idea first before putting it on the roadmaps and devoting money and time towards it? Seems like a management error.
There was interest in Skybridge-like SKUs circa 2012 when AMD developed this strategy, but since then things changed a lot on the Intel front, with HSW-EP servers bringing very efficient SKUs, Atom-C and now Xeon-D. The buzz around ARM servers faded around the beginning of 2014. This is why Nvidia, Samsung and others backtracked from their strategy and the small players either shrank or went out of business. The notable exception is Qualcomm, but they have the luxury of time and money to slowly probe this market to see whether this is a viable one.
AMD was a notable exception here, too small to adopt Qualcomm's wait-and-see approach and with a management team too invested in this strategy to back off, so they pressed further until Rory's dismissal.
That they subordinated their consumer strategy (which pays their current bills now) to their server strategy (a mirage for them after K8 days) is a testament on how deeply invested Rory's team was on this vision, and I'm afraid that the company will pay a heavy price once Zen arrives on the market being unsuitable for the consumer market.
Conroe overclocked just as high.
http://www.anandtech.com/show/2045/18
~3.5 ghz with some chips reaching 4.0 ghz
Zen could overclock well and reach high clocks but I doubt AMD will try to go all out for > 4 ghz clocks.
The overclocked chip, and this after Intel tweaked the process. Stock chips, especially the initial batch, featured much lower clocks. Unless we are talking about 300W water cooled SKUs, I don't think Zen will get even close to 4GHz