Indeed, audio is not routed to the A2DP profile on this build. It was doing so on the previous one.
EDIT: and file transfer by Bluetooth is broken too. When the file comes in, a simple entry appears in the status bar, but tapping on it, nothing happens. Much later, when the file transfer is already timed out on the source device, a pop-up window comes up prompting me to either accept or reject the file.