According to a recent announcement, Synology has released the DSM 6.1 update for their DiskStation, RackStation, FlashStation, and Embedded DataStation lineup.
The latest update brings several new major features including a new next generation Btrfs file system, Windows Active Directory server support, improved shared folder encryption capabilities which allows pre-existing shared folders to be encrypted, and Seagate IronWolf Health Management which provides a wealth of statistics for those who utilize Seagate IronWolf NAS HDDs. A full list of new features and improvements is available on the Synology website here.
The Synology DSM 6.1 is available for customers who own a DiskStation, RackStation, FlashStation, or Embedded DataStation 11-series or later. The update can be found as an automatic update in the DSM Update menu in the Control Panel or can be updated manually by downloading the update from the Synology Download Center.