A new Cumulative Update for Windows 10 Anniversary Update has been rolled out with build no: 10.0.14393.82, for the insiders who are currently in "Release Preview" ring. If you are in Fast ring or Slow ring, will not get this update as it is being delivered from the current branch.
Though it is still unclear about the changes in this build, but hopefully they are some critical bug fixes and performance improvements.
After the release of Windows 10 Anniversary Updates for PCs, multiple cumulative updates have been rolled out till date, whereas the Mobile users just received the Anniversary Update. Within a few hours, new cumulative update rolled out.
This is a cumulative Release Preview build for both PCs and Mobile devices. Those who are in Fast and Slow ring, will definitely not going to get this build. The main reason behind this is, the Release Preview branch has been set for getting cumulative updates only.
The fast ring PC users already started getting Redstone 2 Preview builds from the development branch, where as Microsoft is planning to release new preview builds for fast ring mobile users in the coming weeks/months. Thus, mobile users will have higher version in Release Preview than the one who are in fast/slow ring.
Will update this post once Microsoft publishes the release notes for this update.