Im happy with the current design. The only things I would like to see in a new macbook pro are :
3 USB Ports for the 15"
Quad cores at a decent clock speed
Not that I really need it, but better graphics card
A small, maybe 64gb, SSD Boot drive, with a regular HDD as it is now
Higher resolution, again, not a necessity for me, but who doesn't like a bit higher res.
Battery life is superb now, but I could use another two hours or so.
Besides that, I think everything else is fine. I still havent decide if I'll be selling my current mac and buying the new one. Chances are I won't, but if there is a vast difference, than I may consider it.