How big do you think chances are that the Macbooks (possibly to appear on Tuesday) will be super-slim/super-lightweight, say in the 0.8 inch/3 pound range? Can anybody imagine Apple switching to external CD drives? To me personally internal drives are unnecessary weight. Generally, in what way could the Macbooks be inferior to the Pro's? I haven't seen Dual Core's with less than 1.67 GHz. So will all Macbooks have single cores?