Microsoft made available to at least some Fast Ring Windows Insiders an updated build of Windows 10 Mobile -- its first new test build released in 2016.
The new build, 10586.63, began trickling out to some with Windows Phones at the end of the day (ET) on January 8. The new build is said to be a Cumulative Update. As of 4:30 p.m. ET, Microsoft officials had not released any information about what kinds of features or fixes were in the build.
Update: It seems there was a last-minute problem detected with the staging, resulting in Microsoft temporarily pausing availability of the update, Aul tweeted. The company (as of 4:50 pm ET) is resuming the rollout of the build to Insiders in the Fast Ring today, he said.