No power wires? Like, they run on magic? Or on batteries you have to recharge all the time?
It really isn't an unusual desire, but it just has a bunch of very real issues associated with it.
1. While Denon/Marantz allows for some wireless options, they are based upon packaged systems with surround bars. Nothing that touches what B&W delivers really. Polk makes one which has everything kind of integrated together, but will not be B&W quality, and can't operate with them.
2. So, you will need a transmitter/receiver unit, or find (somewhere) some active (self-powered) speakers which suit your needs. Wireless surround transmitters/receivers are out there and pretty easy to find.
3. Almost all of the receivers require an outlet and provide power for the surround speakers. So, yes, a wire to the speakers to make them produce sound.
4. From there, you can choose any appropriate speakers of your choosing. They will be powered by the wireless receiver, so the quality will be limited to the quality of the wireless transmitter/receiver pair.
I don't think wireless surrounds have really been figured out in a way which satisfies end users. I would love to have a good answer, but the best answer is still 'run the wires'. Yes, you lose one day, but you never have to do it again. Hopefully some other responses will be more useful than mine.