An iTunes dialog box
spotted by iPhone and Mac developer Fraser Speirs
suggests Apple may be considering implementation of upgrade pricing in the App Store. The dialog box carries the heading “You do not qualify for this price,” going on to explain that “[t]his discounted price is only available to customers who own a previous version of this item. To purchase this item at full price, click OK.” Curiously, no “OK” button is offered, instead users have a choice between “Cancel” and “Buy.” The ability to offer current users upgraded software at a discount has been a feature long requested by iPhone developers; Apple has yet to officially announce such a feature.
Update: According to a Mac Rumors forum thread, the dialog box has in fact been in use for some time, and may be presented to users who attempt to re-download or update an application while logged into a different iTunes account than the one used to purchase the application originally.