Dwindling supplies of Apple’s iPhone 4 Bumper case in certain regions may be pointing to an impending discontinuation of the line, according to a new report. Citing information received from informant “Mr. X”, 9to5Mac reports that stock of Apple’s in-house iPhone 4 case is constrained in certain regions, which it takes as an indication that Apple plans to either update or discontinue the line. The report notes that the next iPhone may require an updated Bumper, or may feature an all new design. With some form of the iPhone 4, whether it be a simple change to 8GB capacity or a new iPhone 4S moniker, likely to be sold long after the iPhone 5 is announced, it seems unlikely that Apple would discontinue the product altogether. Instead, it seems possible that it is drawing down current stock to be replaced with a slightly updated revision, or to indicate on the accessory’s packaging its compatibility with the iPhone 4 and iPhone 4S, should the latter become a reality.