Windows 10 Mobile version 10536.1004 is undergoing testing for a rollout next week
An earlier tweet from Aul relayed the information about the bug and the cancellation of Friday's update. The executive said that the new build is currently undergoing testing, and is being evaluated by the team. He added that the update should be available some time this coming week.
Version 10536.1004 is expected to fix problems that prevented the use of mobile Hotspots, and repair an issue with Quiet Hours. That is the feature that blocks all but the most important calls and texts from reaching your phone during those times when you don't want to be disturbed. A bug that made the lock screen lag is exterminated with this build. The new version of Windows 10 Mobile also brings better performance, and a few changes to the Start personalization settings.
source: @GabeAul via NPU, WMPoweruser