For Nokia's sake this should be just the first step. I don't see why they wouldn't want the money from the small applications that Apple is collecting all the time. Maybe when the next generation Maemo devices come available...
If I've understood correctly, Apple app store payment methods include AT&T phone bill. IMO this is vital to make buying the cheap stuff as easy as possible. Nokia has not been able to make this kind of a deal in the U.S.