Microsoft has released Cumulative Update KB3209835 Windows 10 Version 1607 build 14393.594 via Windows Update for Insiders
in the Release Preview
No details have been made available yet from Microsoft. This post will be updated when more details are available.
KB3209835 .cab file direct downloads from Microsoft:
(How to Install a CAB File in Windows 10
KB3209835 64-bit (x64) .cab download
KB3209835 32-bit (x86) .cab download