It looks like aside from the "GA Rollup A" Update
- which should become available in Windows Update soon - all of the core apps for Windows 8.1 are also getting a refresh for todays 7am ET GA release of Windows 8.1.
To get the updates, open the Windows Store
app > Charms menu
> select App Updates
, and then check for updates. The 19 updates include enhancements and fixes made from the original release of Windows 8.1