This update includes improvements to enhance the functionality of Windows 10.As Microsoft has stated before, it doesn't intend to publish detailed changelogs for Windows 10 updates unless they contain significant feature additions or changes. However, according to a video published on YouTube by one user, the update appears to be related to "ESET Smart Security protocols." As an additional note, the update isn't yet appearing on machines running the latest Windows Insider build, so it's possible that this is pushing out to non-Insiders only.
In any case, you should be able to pull the update — which clocks in at a hefty 226MB for 32-bit users and 505MB for 64-bit — through Windows Update now.
Installed smoothly.However with every update feels like a ticking bomb