Why i think Nokia is making a big mistake and might fail.

Is there any definitive to this whole AT&T exclusive deal? If this is true, with the iPhone 5 on the horizon was this a big mistake? I mean, didn't Microsoft say Windows Phone 8 isn't getting outted until October, what if iPhone 5 break those huge numbers like last year, do your think that Nokia even have a change to fight that? People can say what they want about Samsung, but they did what only the iPhone was able to achieve and not only that, bring their product to almost every carrier.