The first cumulative update for Redstone 4 is now rolling out for Insiders in all rings, bumping the build number to 17133.73.
Insiders in the Fast, Slow, and Release Preview rings are today receiving the first cumulative update for Windows 10 Redstone 4. Today's cumulative update bumps the RTM build number to 17133.73, and is packing security updates and bug fixes.
Microsoft were originally rumoured to begin rolling out the Redstone 4 update to the public today, however it appears that will not be the case now. Instead, Microsoft is rolling out cumulative updates to those already running Redstone 4 via the Insider Program, giving the release a little more time to bake before general availability, which is always a good thing.
Full story from the WindowsCentral blog...