Apple's designer, Ive, is going back to the industrial look of his original Titanium Powerbook of nine years ago with the black keys.
And the Titanium of course referred back to the 1960's Braun designs, which in turn referred back to the classic Modernism of the best industrial designers of the day.
Ive's infatuation with Braun is well known. Braun's reference back to design concepts of the Bauhaus onward is well known. Ive is the pre eminent industrial designer of our day, and his G4 Cube deserves its spot in the Modern Museum of Art, as does his iMac G3, his iPod, his Tibook etc.
I think the Al. mb, and mbp's are very beautiful works of form and function. The Titanium also had a silver bezel with black keys. Sort of reminds you of an typewriter.
I looked at my MB the other day, closed. It really is a thing of beauty. Except for the no firewire of course.