strange nobody mentioned it yet, but I'd love to see a built-in eSATA-port to connect one or more SATA disks directly! Well, not that I'm in the market for another MBP, I have a latest rev MBP with a dual eSATA expresscard, but built-in would be nicer 🙂
If they could possibly add another USB port to the 15", that would mean a lot too. But probably adding ports is out of the question due to lack of space inside.
If the MBP's would get a redesign I guess they'll get magnetic latch and MB-keyboard. I like my MBP keyboard, but they've adopted the MB keyboard for the iMac, and a "regular" external keyboard isn't available any more, so the Mac Pro's will probably get the iMac keyboard too in a couple of weeks, which would leave only the MBP with the "old" keyboard, which is highly unlikely. Therefore, the MBP keyboard will probably get updated as I see it: to keep it in line with the rest.