The new update changes the version number from 2015.10.13.1 to 2015.21.12.0. As you can see in the screenshots, the menu selections have had their order changed. The "Library" and "Downloads and Updates" selections, for example, were on the bottom part of the menu but are now the top two selections.
Windows 10 and Windows 10 Mobile users can click on the "Check for updates" in the Store app if they don't see the new version yet. If you do see or notice any other changes or improvements, please let us know in the comments.
Thanks to everyone for the tips