I know I am going to get disliked for this, but this is probably it, if you look at the different sizes and layouts of the air vs the pro, you will find that to keep the thin profile of the air, the logic board had to be really small. To keep the power of the MBP, you need a much bigger logic board, now think, the 13 inch air and the 15 inch pro only are about 2 inches bigger then each other, so you don't have that much more space to work with, but you have to cram in a Quad Core i7 and 2 graphics cards and you still have to have a massive, super slim battery to keep the 7+ hours on a charge. The second thing is heat dispersion, the Sandy Bridge MBP's always were very hot (my friend has one), if you make the design thinner, you also have to think about making sure the heat can get out properly, make the design thinner, and you have to worry about more heat, and with an MacBook Air profile, i don't know if you can even have 2 big fans. The last thing is, a lot of Pro's still need a DVD drive also ethernet and FireWire (me included), sure I can live without them, but it is much easier to have them. I don't think this design will be ready for a while longer, the MBP's have a very solid and thin design while having a lot of power under them. Remember the PowerBook G4 deign (which was carried on to the first MBP) was almost 5 1/2 years old when it was replaced by the unibody MBP, and the design was only changed because it was better to manufacture them this way, and made them stronger, but it only lost .05 inches during the change of design. The 2012 MBP will run much cooler, and be faster then the 2011 models, but THEY STILL MIGHT HAVE A RETINA DISPLAY!