Just wanted to show off a proof of concept. I have my basic dashboard setup pulling the currently playing album art in the living room straight from Sonos. I use a raspberry pi running the Node-Sonos-HTTP-API to interact with Sonos from a variety of applications around the house. I have a little app running that pulls the album art URL from there and automatically redirects a request to show the album art and put that in a media tile. Works pretty well! Would be lovely if Sonos ever opened up their API to be able to do this without so many workarounds.
Customer support service by UserEcho