The newest update has added two new abilities that are fantastic. The first is that you can now mount network attached storage drives to the console. I have a few hard drives attached to my network, including an older Synology 413j NAS. In the settings panel of the Shield, you can now go to the storage settings and it will discover your NAS drives. You can then connect with your user name and password and a few seconds later the drive is attached. Of course, if you are running other apps that need access to your storage, like Kodi, they will also see the NAS as local storage.
Plex Media Server
You can now run the Plex Media Server on the Shield, not just the Plex client like most consoles. To set it up, you simply launch Plex on the Shield, chose the "enable server" option and you are up and running. You then go to Plex on a web browser, chose the files you want to add to individual libraries (like Movies, Photos, and Music) and you simply wait for them to load.
Once that is done, you can access the files directly on the Shield, pull them up on a mobile device, or even access them from the Plex app running on another media device. I tested playing movies from the Sheild's Plex Server on my AppleTV 4 and it worked great.
I should mention that I have the 16GB version of the Shield, so essentially being able to add 8 terabytes of storage or more to the device is awesome!
Not as big of a deal, but Vudu 4k was also added to the platform. Since I have about 90 movies on the service, it is nice to have access to them. They also added HDR to their Netflix app, Dolby Atmos pass through for certain services, Youtube 4k in 60fps, etc.
Yep, pretty darn awesome! Read all about the 3.2 upgrade here.