Obviously requires a U.S. credit card at the moment, but reports are that once you've set it up (change your region settings to the U.S.) it works with normal payWave/PayPass terminals in Australia.
Will it be the same here?
I don't have a 6 yet, but added my card to a mates last night (he now has to find something less than 1 usd as that's all I have in my US account!)
I'm still not 100% sure what Apple pay needs to work, and there are conflicting reports on existing EMV standards, new tokenisation standards etc.