I read that document and you're right! It appears to follow the formula of their last 5.1 Soundbar, the 510, which also has the satellites tethered.
I wonder if the larger version uses the same method.
The forthcoming Philips 5.1 soundbar definitely has completely wireless rears. More money, though.
Interestingly, the Phillips uses a wireless technology that is similar but not identical to Bluetooth, and it appears that there will be less possibility of interference than with a Wifi based system.Edited by taichi4 - 4/11/13 at 2:37pm