(http://s18.postimg.org/67yl0rta1/Build_14393_479.jpg)
Microsoft is currently rolling out Windows 10 Build 14393.479 to Insiders on the release ring on PC and Mobile.
The cumulative update should eventually roll out the smartphones and PCs on the Anniversary Update (ie general release) and should bring the usual bug fixes and performance improvements.
A full changelog is not available yet, but Insiders on the release ring can download the update by checking for updates.
source:mspoweruser