The current incarnation of the Uber Windows Phone app launched about a year ago, after a previous version was released in 2013 and pulled a month later. This week, the Uber app was updated for the first time in a few months, but this is apparently a minor new version release.
According to Uber's own change log for the app, "we've made significant improvements in app stability." That's good news if you use the ride-sharing service frequently, but there doesn't appear to be any new features with this release. If you notice something else that may be major, let us know about it in the comments.
Thanks to ajkp13 and Yasar for the tips!