Does Skype for Business work with UCMA, UCWA, and the Lync client SDK?

I am not working under any NDA so here is what I have seen with my own eyes.  Yesterday our software was tested against Skype4B beta a reseller site.  Both the back-end UCMA 4.0 and front-end Lync client SDK worked exactly the same as they do against Lync 2013.  My impressions are, there is very little function-wise different with the client, most of the work seems to be in the realm of aesthetics.  There are some upgrades on the back-end, most notably SILK as the new video codec, but that doesn't seem to have any impact on the SDKs we use to the server or client.

Doug Routledge, C# Lync, SQL, Exchange, UC Developer