The next MB revision. What I'm really curious about, however, is what will the next MB revision look like. Will Apple keep encasing them in plastic? Somehow I doubt that. Also, what will it do for the MB based on what it will have learned from the MBA experience? According to our trusty Buyer's Guide, they're due for a revision in about four months. Can I wait that long? Probably.
I would guess Apple will change the MBP enclosure long before it changes the MB enclosure.
The MBP case, simply stated, is looking pretty stale.
I'm surprised you prefer it to the MacBook case as it's so G4-era while the MB look and feel is much more in line with the Intel machines.
I'd wager the majority of MacBook Pro owners would prefer the MacBook case if they could have the same internal components inside it.