Slightly new looking Photos app and few other improvements.
According to Windows Insider Blog, there will be releasing an update to Photos app in Window 11 that introduces a brand new photos-managing experience. This update brings a good-looking gallery, simplifying browsing experience, finding, management and consumptions of the collections of your photos. Users can also backup their photos easily with OneDrive.
The new multi-window and multi-screen views in this Photos app are one of the smaller new additions. Microsoft is also making it simple and easy for you to manage and import photographs directly from cameras and phones using that new sidebar.
However, the new updated Photos app will be removing the legacy video editor where users have the ability to create and edit quick videos with it. Instead, Microsoft replaced it with Clipchamp being the new video editors in Window 11. Even so, you can still download the legacy video editor on Microsoft Store if you prefer to use it.