Symantec have released Symantec Endpoint Protection 12.1.6 MP2 on 1 October 2015.
Product is available for download on FileConnect.
Mac 10.11 OS Zero Day Support has been included.
Release Notes and Fix Notes are available https://support.symantec.com/en_US/article.DOC9101.html
Yeah, windows client version will not be changed.
Just logged a call with Symantec as file connect does not appear to have the MP2 client files (even thought it is named MP2).
Downloaded and installed to test server - client says 12.1.6 RU6 MP1a
Saw a note on a forum somewhere, that there is no Windows MP2 client, still remains 12.1.6 RU6 MP1a