As is to be expected at this point in the release cycle (very close to a final Creators Update build), there's no new features in this build, just some more bug fixes. The fixes themselves are fairly boring, but one of the "known issues" from this build caught my eye:
The upgrade path from the Windows 10 Anniversary Update (Build 14393) to this Windows 10 Creators Update build is not yet live and will be live tomorrow morning.
So, Microsoft, your internal testing has started on the upgrade process from the last public build .... well, well, well, you clearly feel very close to release. Unfortunately, the upgrade path for Windows Mobile isn't working quite as well yet:
Updating from the Windows 10 Anniversary Update (Build 14393) directly to this build won’t work. There will be an extra hop required to get to this build. If you use WDRT to go re-flash your device and join the Fast ring, you will not be offered this build and instead offered Build 15055. Once you’re on Build 15055, your device will find Build 15063 and take the update then.
As ever, the full release notes are here for your perusal.