https://wccftech.com/windows-10-iso-files-are-now-out-for-20h1-build-19013/

New Windows 10 20H1 ISO files have been released. These latest ISO files are available for Build 19013 that was released to Insiders in the Fast ring last week. This particular build brought new kaomoji, newer version of PowerToys and some WSL 2 improvements.

Microsoft last released ISO files about a month ago for build 18990. But you can now clean install a latest build of the next major Windows 10 version. As reported earlier, Microsoft has internally almost finalized Windows 10 20H1 potentially planning to deliver the RTM build to Insiders at the end of this year to align the release with Azure. This is probably why we aren't seeing any new features being tested with Windows 10 20H1 anymore.