Chargespot makes a charger that has both Qi and Powermat, it isn't a difficult problem to support both:
http://www.chargespot.com/documents/ChargeSpot-Product-Sheet...
WPC 1.1 is Qi
I belive the only reason Starbucks has Powermat only is because they were provided for free by Powermat. The fact is that built into devices, Qi is far more common, but where or where is Apple?
