New
#11
Sorry, yes you are on the latest build, there should also be a number after the 10586, mine is 10586.218. You may still have one of the smaller updates to complete. The last one was three weeks ago - KB3147458.
Here is a link with more information: KB3147458 Cumulative Update build 10586.21 for Windows 10 Version 1511
One of the improvements was video playback.