From what I can see here, the body appears to be made of one piece of aluminum like was predicted earlier. It also has much smaller speaker holes - onces that would be best be drilled by laser than a micro drill bit. The keys also look to be laser cut.
The ports indicate that there will be a mini-DVI port on the side instead of the current MacBook's regular DVI port...
The thickness, or better yet the thin-ness of the side panel is also very impressive. It looks to be about 2/3rds as thick as the current model with the bottom panel being thinner than the length of a USB port.
To extrapolate a bit further it looks like it might have the 16:9 16.1 inch screen we've heard much about.
From a Macrumors forum poster:
some measurements assuming the keyboard is the same length as that found in the MBA.
CAPS LOCK KEY = 1.25"
MBA FROM CAPSLOCK TO RETURN = 10.75"
IMPOSED CAPSLOCK KEYS FROM CAPSLOCK TO EDGE OF CASING X BOTH SIDES = 5"
The bottom casing is 10.75"+5.00" = 15.75"
The MBA screen-enclosure (measured diagonally) to bottom-case ratio is 15" to 13"
That ratio applied to 15.75" would suggest 18.17" accomodate for the fact that screens NEED some border and we have a 2-inch reduction.
The NEW Macbook 'Brick' will have the rumored 16" screen. TRUE 16:9 resolution!
Apple's passed its October 14th press invitaion limit so either we won't have a press event or it will be released a bit later than anticipated.