If it isn’t there yet, please add a small LED or some other way to tell Bluetooth is paired, and make sure there is a direct AAC streaming mode in Bluetooth under iOS/MacOS, in addition to AptX (which is still in many ways a recompression).
BTW, the lack of MacOS Airplay might be a major turn-off for many. Be prepaired to discuss that ad nauseum in forums.
And, with a switching mode power supply, can’t you just make a single model for 110/220/230 Volts mains? It’d be really cool for people travelling.