There is a new version of the Server.app which is the way Apple updates the whole server bundle. The new features are
What’s New in Version 2.2:
- Caching Server to speed up download of software distributed by Apple through the Mac App Store.
- Time Machine service monitoring of which computers have backed up, when they last backed up and size of backup.
- Wiki Server support for MacBook Pro with Retina display.
- Fix for deleting apps uploaded to Profile Manager.
- Ability to use Active Directory groups within Profile Manager.
- Centralized Certificate management interface.
And for the bug fixes you can visit https://support.apple.com/kb/HT5583