I have feeling there won't be a 13" pro Retina, at least not anytime soon. Considering the 15" Retina weighs about the same as the current 13" pro and has the screen real estate of the 17", seems like a merger of the 3 lines. The 15" Retina becoming the only Pro machine and the rest Airs, maybe an improved 13" Air to cover that market. If people want a larger screen, then they'll have to go with an ATD, or even iMac/MacPro route. I think those last two are also threatened by the 15" retina/ATD como.