The short answer is: No One Knows! The topic is touched on the later parts of the thread "Mobile Phones ... CAA" running in Rumours & News.
As I understand it, Connexion by Boeing does use wifi but the power levels are considerably lower than for a mobile phone. Manufacturers should have placed an easy hardware or software button to disable this feature but may not have done. If the software off-switch is through a couple of menu's try placing a shortcut to it on the desktop and turning it off before leaving for the airport, or whilst in the lounge.
'Bluetooth' is a another short range radio system used ofr mobiles, PCs and PDAs (amongst other things). This should also be turned off as no one yet knows how problematic it can be. (I sit to be corrected on this point)
"Radios that comply with the Bluetooth wireless specification operate in the unlicensed, 2.4 GHz radio spectrum ensuring communication compatibility worldwide. These radios use a spread spectrum, frequency hopping, full-duplex signal at up to 1600 hops/sec. The signal hops among 79 frequencies at 1 MHz intervals to give a high degree of interference immunity."
We are at the beginning of investigating and regulating the problem of RF generated by Pax held devices.