The Sonos Beam doesn't just receive HDMI signals, but sends them out too. This is evident by the fact if you select your source to the HDMI ARC connection the Beam is using, you get pre-designed patterns being sent as video to your TV.
What if Sonos could update the speaker to display music covers, music videos, music details like; time, title, artist etc.?
Short and sweet, but I think that would be awesome.