The Fox News app for Windows 10 has been updated this week, turning it into a UWP app for both PC and Mobile. However, it is just a web app using Project Westminster and not a native app for Windows 10.
Aside from the UWP upgrade, there does not appear to be any new features with the Fox News app with this update to the TV cable news app. Here's its brief description:
Get comprehensive coverage of the day's hottest stories, Fair and Balanced headlines, vibrant photo galleries, the latest video clips from your favorite shows and more!
Keep in mind that there is another Fox News app in the Windows Store that is just for Windows Phone 8.1 users.
Thanks to Ben and Joshua for the tips!