The big change is in regards to the Music apps, which now grabs the new branding of Groove Music announced earlier this week. Everything from the new Live Tile (which reveals now playing info) to the app itself has the new Groove label on it. No other changes are noted.
The version has been updated for phone and Windows 10 desktop. Look for version 3.6.1154.0 in the Store for the Groove labeled release.