For me, my perfect MBP (13") would be this:
-Higher resolution display
-Quad-core processor (although the i5 dual core now is plenty for me, but you can't go wrong with more right?)
-8GB RAM
-Dedicated graphics (I want to take up photography and video over the summer and would like to edit video and whatnot, perhaps play a few games as well)
-No ODD (I have an external from when I had a netbook... bad times)
-SSD+HDD combination
-Don't mind the size and weight so it can stay the same (I use a backpack when I'm at university so I can hardly feel it)
-Keep the ethernet (wifi doesn't reach every part of my house so we're wired up in every room, therefore no need for wifi extenders)
-More than 2 USB (USB 3.0), preferably on both sides
-HDMI port so I can connect it to my TV without an adaptor, although I'm saving up for a used thunderbolt display when they are much much cheaper
-The same battery life!
This won't happen but if it does then I will part with the little money I have
Edit: I would love the return of the black macbook, perhaps that can be an optional extra?