"though analysts still believe a mid-July debut is more likely, as the timing will be right for initial iPhone buyers to upgrade."
This ignores the fact that Apple and AT&T waived the equipment upgrade fee when the 3G was introduced allowing iPhone users to upgrade well before the end of their contract. They will no doubt do this again so this reasoning isn't valid.
"though analysts still believe a mid-July debut is more likely, as the timing will be right for initial iPhone buyers to upgrade."
This ignores the fact that Apple and AT&T waived the equipment upgrade fee when the 3G was introduced allowing iPhone users to upgrade well before the end of their contract. They will no doubt do this again so this reasoning isn't valid.