Following a report that Apple is currently testing multiple next-generation iPhone prototypes with a taller Retina display, images of a purported front panel from an unreleased iOS device may provide further evidence that Apple is working on a new iPhone with a larger display. MacRumors on Tuesday published two images of what its unnamed source claims to be the front panel from an upcoming refreshed iPod touch. The opening for the display panel is taller than the one on Apple’s current iPod touch, measuring 4.1 inches diagonally. If the part is authentic, it suggests that the next iPod touch — and Apple’s upcoming sixth-generation iPhone — will include a larger Retina display. The Wall Street Journal and Reuters both reported last week that Apple plans to release a new iPhone this year with a display that measures at least 4 inches. Another image of the purported iPod touch front panel follows below.