Today, Microsoft has announced the availability of Windows 10 build 14366 for Slow Ring insiders. This means that official ISO images of Windows 10 build 14366 will become available for those who want to install this build from scratch.
Earlier, Microsoft has released Windows 10 build 14366 for Slow Ring insiders, but ISO images were not released until today.
This build is from the Redstone branch which identifies itself as "version 1607". Version 1607, known as "Windows 10 Anniversary Update", is expected to be released next month. This new build comes mostly with bugfixes, so you will not find many new features.
You can see the list of changes here: What's new in Windows 10 build 14366.
The latest build for Fast Ring insiders is 14372. See these links: