Speculation as to the actual size of a larger next-generation iPad is continuing, as a report from Japanese magazine Mac Fan (via MacOtakara) purports to offer specifics as to the device’s dimensions and features. A schematic suggests a design nearly identical to the iPad Air 2, only with a larger 12.2” screen and a total of four speakers spread across the top and bottom of the tablet for orientation-agnostic stereo sound. Mac Fan claims…