This is a pretty awesome development. If AirPort Express indeed picks up properly implemented support for AirPlay 2 via a firmware update, you will be able to use AirPlay 2 with almost any speakers you have sitting around. Pro tip: AirPort Expresses are dirt cheap on eBay at the moment.
Learn how to create a QR code that will automatically connect your friends and family to your Wi-Fi network when scanned. Simply print this QR code and leave it in a drawer or maybe in the guest bedroom of your house.