More Btrfs support, encrypted folders. https://www.bit-tech.net/news/hardware/2017/02/23/synology-diskstation-manager-6-1/1
Boasts of boosted performance. http://www.bit-tech.net/news/hardware/2016/06/03/synology-ds416play/1
Space-saving and security gains. http://www.bit-tech.net/news/hardware/2015/05/15/synology-dsm-5-2/1
Security-focused upgrade for the NAS OS. http://www.bit-tech.net/news/hardware/2014/11/07/synology-dsm-51/1
Can operate as a router, if you'd prefer to use gigabit Ethernet for your data transfers....
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