One time number?
So instead of multiple parts of numbers on a card that is needed for a wireless transaction (im assuming this is the case) all hackers will need to do is reprogram a RFID chip with any random number to use someone elses account. This sounds to simple to be true... I went to a cashless festival (Download) the other month and everyone was given a chip which i assumed had a simple unique ID for your account. They were reprogramming these chips left, right and center because of bugs. I hardly think apple will just link it to a unique number.
P.S Apple is doing nothing new, I like certain wireless tech but all my bank details in once place. No thanks.