I heard from a friend of mine that technically, S2 is possible on S1 hardware - and all it takes is for Sonos to enable it on your system (which seemingly they can do remotely, presumably though your log on account).
I’m told that if you have a big enough setup (ie. you’ve spent enough money with them) and make enough of a fuss, they’ll enable S2 for you. I have no idea if there are limitations once done, but S2 isn’t wildly different from S1 anyway, so probably not.
Anyone know any more about this?