Windows 2016 will be released later this year and along with it a few additions will be added to the Directory Services piece. Below are a few of the notable additions that i am looking forward to.
New Features
1. Group Membership Expiration - You will be able to add a user to a group for a certain period of time. The one drawback is this feature requires windows server 2016 functional level.
2. Azure AD Join -
3. Deprecation of the File Replication service
4. Deprecation of Windows Server 2003 Functional Level