One name I know from my audiophile days, for excellent if power hungry and expensive speakers, is Dynaudio.
I just came across their wireless offering that looks to me to be the first Sonos like solution by a legacy firm, admittedly at much higher price points. Multiples higher, most likely.
Their streaming core unit happens to also be called Connect:)
See this for more:http://www.dynaudio.com/home-audio/focus-xd#features
At first reading, it looks like a Sonos contender in full traditional HiFi attire, including wireless floor standing active speakers. It would be interesting to see a comparison of a 5 pair compared to their starting speaker offering, an active stand mounted model.