WiSA

Wireless Speaker & Audio (WiSA) technology is an open industry standard to connect speakers wireless.
It allows for lossless 24-bit audio with sample rates of  32, 44.1, 48, and 96 kHz
It supports 2 channel up to 7.1 surround.
It operates in the 5Ghz U-NII band.

 

At the present (2013) B&O is the only brand known to me using this standard.

As Pioneer, Onkyo, TEAC, Klipsch en Sharp are members of WiSA too, one might expect them to bring out models in the near future.

 

 

Beolab 17 speaker with WiSA and Toslink input

B&O Transmitter1 with analog and Toslink input.

 

References
The WiSA™ Association