Microsoft is making available Windows 10 build 17738 for testers with PCs enrolled in the Slow ring of the Windows Insider Program.
If you’re enrolled in the Slow ring, you can check all the improvements in this guide, and you can also check out this video review.
Download Windows 10 build 17738
Although there are no ISO files for Windows 10 build 17738, the update is available immediately through the Slow ring. This preview build will download and install automatically on your device, but you can always force the update from Settings > Update & security > Windows Update and clicking the Check for updates button. (You can learn how to join the Windows Insider Program on this video.)
You can also check out these resources: