Granted, the leaked sheets do mention that what is shown is but a prototype, and since September 9 is right around the corner, one cannot really make any last minute changes, so what we have here ought to be pretty darn close to the real deal when it finally arrives.
The N51 does share rather similar specifications with that of the outgoing iPhone 5s, where it measures 4.87” x 2.31” x 0.3”, tipping the scales at 112 grams. As for the N61, it will be the 4.7” model as it measures 5.44” x 2.64” x 0.27”, although the weight remains unknown. Last but not least would be the N56, which will carry a 5.5” display, and the second prototype measures 6.22” x 3.06” x 0.27” while weighing 184.6 grams. Could all of these be an elaborate red herring by Apple? Only time will tell.