Windows 10 Mobile has released an unannounced update for the Instagram beta app in the Windows Store. At this time, release notes have not been published for the new version.
The last Instagram beta update a few weeks ago included some minor improvements to performance and added a transparent live tile, Facebook login, and a small list of bug fixes.
We will stay up to date to provide you with the release notes when and if they are published officially. In the meantime, go ahead and open up the Windows Store and hit that update button.