A Sonos port (along with a suitable 3rd party external amplifier) should be able to setup with a Sonos Arc/Beam/etc used in lieu of the seemingly ALWAYS backordered Amp for Surround Sound. If it has to be Ethernet connected to the Sonos system or LAN, that is fine.
Along the same lines, would be nice to see a multi-room Port with 4 and/or 6 zones in a 2U chassis for Custom Integration. Each of the 4 or 6 zones would also be able to be commissioned in a Surround config.