New
#1
Kb3107998
MS has not put out much info on this optional update yet.
Clicking on this "More information" link...
(https://support.microsoft.com/en-us/kb/3107998)
...gets one this website/info:
(The website will probably update at some time in the future.)
(Searching that website for KB3107998 yields no returns.)
The Update catalog shows this info:
Which leads me to think that today's mystery update replaces this:
https://support.microsoft.com/en-us/kb/3045645