The new MBP 15 inch model will have the same physical dimensions and weight as the current MBA 13 inch model due to the fact that Apple will fit a 15 inch screen on the 13 inch chassis. The current MBA 13 inch model's dimensions are 12.8 x 8.94. 12.8^2 + 8.94^2 = 243.76. The square root of 243.76 = 15.61 therefore a 15.4 inch screen will easily fit on the smaller chassis. By using edge to edge screen technology, the new MBP will set a new standard for 15 inch computers. Unfortunately for those that just purchased a new MBA, their computers will soon look quite dated.