Makes sense to me. Probably something close to the Macbook Air. The Air's tapered shape is cool because it doen's bend (and consequently squeak) why you hold it by one corner.Depending on how much thinner the MBP will get, the tapered shape might be necessary. I love the Macbook's keyboard (love the sloped standalone keyboard even more) and hope the MBP gets these too.
When you think of it, there isn't that much to improve. I don't know if the magenetic latch would work as nicely on the Macbook pros as it does on the 13" models. There are 2 magnets on the top edge of the screen bezel. When you open the lid, there's quite some bending happening on the display. This might get problematic on larger sized displays. Don't get me wrong, the metal hooks are fa better than those ugly mechanisms seen on other laptops but they're still dirt catchers and breakable mechanicle parts. With the magnets, you don't see them, you can't break them and there won't be finger dirt accumulating in the hole below the trackpad.
One cool thing would be the ability to swap hard drives easily. The Mac Pros have those little drawer things that you can just pop out. It should still require a screwdriver though. I'm not comfprtable with the idea that anyone could take the hard drive from my Macbook Pro which is secured via kensington lock.
