Update 2107 for Microsoft Endpoint Configuration Manager current branch is now available.
Many customers have lots of collections because for every application they need at least two collections: one for install and another for uninstall. This practice adds overhead of managing more collections and can reduce site performance for collection evaluation.
Starting in this release, you can enable an application deployment to support implicit uninstall. If a device is in a collection, the application installs. Then when you remove the device from the collection, the application uninstalls.
There are many more new features. Please see Microsoft ConfigMgr blog for complete details.