Like many of us, I am really excited about this.
It looks like it is getting close. Look at what I found on the QNAP site:
When displaying content using HDMI outputs, you can use the TS-853A as an amazing multimedia player by using HD Station to enjoy rich apps including Kodi™, HD Player, Plex Home Theater, YouTube™, Spotify®, JRiver, Google Chrome™, Mozilla Firefox®, and more. Alternatively, you can choose to output the Ubuntu desktop to use the TS-853A as a PC.
It's not my model QNAP, but..... there is the JRiver name on a qnap page.
Don