Microsoft rolled out a cumulative update (Build 10586.36) to Windows 1nsiders on Windows 10 Mobile.
This will bump the build from 10586.29 to 10586.36 and brings various enhancements and improvements as well as bug fixes to issues found in previous build 10586.29.
This update already started rolling out to Windows 10 PCs and tablet earlier in the day and then hours later Microsoft rolled it out to Windows 10 Mobile phones. Both PCs and Phones are running on the same Build.
Microsoft noted that there will be no new builds until 2016 as most engineers are taking time off (festive season) to spend time with their families.
The last Build 10586.29 was released to those enrolled in Fast Ring but later got released a couple of days later to Lumia 950 and 950XL users who weren't on the Insider program. It would be interesting to see if the same happens with this new 10586.36 Build.
You can read more about it on Microsoft Blog