I hope for the MacBook the casing becomes Aluminum, One USB 2.0 port is added to the right side, they get rid of the damn combo drive on the base model, they receive a 200MHz to a 400MHz speed boost, a higher 1066MHz FSB, a actual GPU (I don't know what kind really, so long as it is a improvement over the current graphic abilities of the MB), another 20-40 gigs added to the HD storage space and a price drop of 150$ on each model.
It will never happen though, one of the things about loving Apple's operating system is you need to use the hardware (legally anyway).
As for the MBP, the express slot should be bumped to a average size. One more USB port would be nice, the same speed bump and same FSB as the MB, a s-video port would be cool, they should loose the firewire 400 port IMO, the HD space should see a increase of 30-60 gigs (all being 7200 rpm), the frame should become something unique (like stainless steel), and the HD should be user more use accessible (like the MB). A price drop of 150-200$ on each model would be nice as well.
I hate Apple's over priced hardware, although it is getting better. But these are all just my opinions.