If Sonos were to add any more channels to the current maximum Arc setup of 5.2.2, it would most likely be adding an upfiring driver to a rear surround speaker like a Sonos One to create two more height channels for a 5.2.4 setup. I could also see them possibly allowing the option to add left and right side surround speakers for a 7.2.2. setup. The Arc already covers the center, front left, and front right channels.

A few points on this….

Sonos rarely will let you know what new products and features are coming in advance.  So don’t expect an answer to your question. 

Sonos staff has several questions to answer before expanding their home theatre offerings.  First, is there in a big enough market to justify development and possibly creation of new hardware?  Second, can they add additional wireless speakers in a home theatre room in a typical home (with potential wireless interference) and have it work reliably? Right now, there are 4 devices (4 with 2nd sub) in a room, and you’re talking about adding at least 2 more wireless devices that need to be in sync with very little time to buffer to avoid lip sync issues.

I am all 4 adding in more speakers, and would likely buy into whatever Sonos has to offer.  I’m just skeptical that it’s going to happen for various reasons.  

Thanks for the feedback. Makes sense. I would actually entertain either option (5.2.4 or 7.2.2). Hopefully WiFi won’t be the limiter here. After all, that’s their claim to fame.