The big one as far as we're concerned is an increase in audio bandwidth that will enable the introduction of 'higher resolution technologies for music and home theatre'. Thankfully, Sonos has also talked up a few other upgrades that sound much more thrilling even though they've not yet been fully detailed. Room Groups is neat but not terribly exciting in and of itself. This feature is live now and is very straightforward in use. This allows users to create lasting groups of particular zones that you often use in unison - the lounge and kitchen, perhaps - so that you don't have to do so every time you start playing. Only one specific feature of S2 has so far been outlined, and that's something called 'Room Groups'.
