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I believe that only the iPad Air and iPad Mini with retina display got the panoramic option in photos. My iPad 4 certainly didn't.I should add that Pano mode may not be available on all iPad models. It got added to the iPad Air, but older models may not have received it.
While things like Extensions and iCloud drive are part of the basic iOS 8 upgrade, some other features may not be available on older models; either because the hardware won't support them, or Apple has decided that the experience would be poor on slower hardware.