It’s been possible to use Bluetooth for a while, but a bug prevented Bluetooth and Wifi from running stably at the same time.

I threw together a Bluetooth speaker firmware - for some of our (Pimoroni) boards - with FFT visualisation quite some months ago - https://github.com/Gadgetoid/galactic-bluetooth-audio

Album art display is also possible but small matrix displays don’t lend themselves well to it - https://github.com/Gadgetoid/galactic-bluetooth-audio/pull/1...