The retina MacBooks are the wrong darn resolution. The 15" is effectively 1440x900 and the 13" is 1280x800. How is that innovation? The 15" needed to be at least 3360x2100 (1680x1050) and the 13" needed to be at least 2880x1800 (1440x900). I found all the retina MacBooks to be useless because, ironically, in retina mode there's not enough damn real estate to work with!
It's innovation because they are NOT at that resolution....And you can scale the display, and still have a much greater pixel density than(at the time of release) any laptop on the market....