Can confirm this is working beautifully now with the pi3 and the x400 which arrived in the mail today. Sounds great!
I hope to play around with the backend of Arch in a week or two when my DVB-T dongle arrives. It should be able to decode FM and DAB+ radio via command line apps. If I can get that working then maybe the devs will help me integrate it into the main image. I'll also see if I can get a USB powered dvd burner working to play normal audio cds as well as possibly DTS dvd if the pi has enough processing power.
Thanks to frank and the devs for updating to pi3, I appreciate it
-D