Microsoft may be planning to release a new Windows 10 Build 20175 to the Dev channel today. It may also release official ISO images for this build as per the information posted online.
This information has been provided by well-known Microsoft enthusiast WZor on Twitter.
In another tweet he has leaked information about the placeholders of ISO images for Build 20175.
So, while it is not known what new features and changes this build will bring for insiders, it does seem to be one of the important builds. Official ISO images of usually those builds are released by Microsoft which may have some impact on how future builds and feature updates are released.