As we get closer to the final release of this new version, the builds come quicker and quicker. Up today, we have build 17112 for the Windows 10 Fast Ring Insider group. Definitely some things to check in the Known Issues section as it might affect you. Also, be aware of a critical Windows Mixed Reality bug if you have a WMR device.

Known issues

IMPORTANT: The Microsoft Store may be completely broken or disappeared altogether after upgrading to this build. Please see this forum post for details including a workaround on how to get the Microsoft Store back.
If you try to open a file that is available online-only from OneDrive that hasn’t been previously downloaded to your PC (marked with a green checkmark in File Explorer), your PC could bugcheck (GSOD). You can work around this problem by right-clicking on these files and selecting “Always keep on this device.” Any file-on-demand from OneDrive that is already downloaded to the PC should open fine.
Post-install at the first user-prompted reboot or shutdown, a small number of devices have experienced a scenario wherein the OS fails to load properly and may enter a reboot loop state. For affected PCs, turning off fast boot may bypass the issue. If not, it is necessary to create a bootable ISO on a USB drive, boot into recovery mode, and this this will allow bypass.
When Movies & TV user denies access to its videos library (through the “Let Movies & TV access your videos library?” popup window or through Windows privacy settings), Movies & TV crashes when the user navigates to the “Personal” tab.