oh.. that is a shame, as it seems like a natural progression to allow for wireless control with the same capabilities as the wired option, the OSC protocol is so well suited for realtime sequencing and performance environments, i have been using the ethernet shields with great success and was really excited about the prospect of making my projects go wirelessly, the osc protocol works really well wirelessly and there are some great apps that allow for building great interfaces.. the wifi shield i am using is this one: http://arduino.cc/en/Main/ArduinoWiFiShield
which i think does support TCP/IP but again sadly this is a bit above my technical knowledge, it is frustrating knowing that there has to be a solution out there to a problem but not having the necessary skill set to realise it