"Multi-room digital music streaming specialist Sonos has finally gone wireless ... To date, ZonePlayers in different rooms have had to be connected with Ethernet cabling, or via mains electricity networking boxes."

What rubbish... The ZP80 and ZP100 have always been wireless, using their own wireless mesh technology. As far as I know the only limitation is that at least one player needs to be wired to a network. Any players after that will communicate wirelessly with the first. This product obviously just removes the need for any players to be physically wired as well as acting as a wireless bridge between distant players.