A slimmer Pro line seems to cut into the idea of the Air line of laptops. I mean... once a Pro is slimmer, I really see no difference between a 13-inch Macbook Air and a 13-inch Macbook Pro (slimmed down). I'd probably go for the Pro in that instance, as weight isn't a huge issue... and size would be so similar (unless if they slim the Air line alongside the Pro line being slimmed down... though there comes a point where you can only get so thin! lol).
I simply hope graphics horsepower isn't ignore as things move forward. And I also hope battery life improves accordingly, rather than simply keeps up with the slimming of things. Otherwise, Apple has almost always been quite good about screen quality, keyboard quality, touchpad quality... etc, etc, etc... The only things that really are to be worried about (and only for some) are the graphics, and the battery. They tend to do well with both... but I mean... look at the new Macbook Airs, or the 13-inch Pro line... graphics is quite lacklustre. Decent. But still not impressive. It keeps up with the product and the other parts, but almost everything stands out as being amazing as opposed to the graphics. The battery life also is somewhat like that: Decent, and not detracting from the experience, but just not *that* amazing. If Apple could give the graphics solutions and battery life the same *wow* factor as everything else they pack into their machines (inside and out), I think I'd be keen to switch over to being purely Apple-based for my computing needs.