Gizmodo tore into their review unit and took some pics and video. Looks like it's pretty trivial to get into the MacBook Air. Some of the 10 case screws to remove the base/bottom are different sizes and there are 9 screws that hold in the Lithium Polymer battery pack, but it looks pretty easy to do.
The US Gizmodo site has taken down the photos, but they are mirrored here:
http://groups.google.com/group/mac-b...-down-pictures
Dave