I and many people in this forum are dreaming of, and expecting a lot more than that....
A Significantly Higher Resolution Screen (I would like to see the higher end 15" MBPs with both a Blu Ray Drive and 1920×1200 Resolution, Even if OSX has to be upgraded to render bigger text and icons at that resolution)
I sincerely hope not. 1920x1200 on a 17" is already a little too high, so 1920x1200 on a 13" would be heading for dire straits. Even 1920x1200 on 15" would be extremely far too small, IMHO.
You state OSX could, theoretically, be coded to upscale the font sizes etc., but web graphics, text, raster graphics, and Flash could never be. To borrow Jobs' quote adapted for my own use, it'd just be one huge bag of hurt.