As with most Apple products, iFixit curiously explores the innards of the new MacBook Pro with Retina display.  While the Apple products keep progressing with higher specs and a thinner profile, iFixit finds it is not without cost.  Their initial compromise is the pentalobe screws which are proprietary to Apple and secure the bottom cover to the new MacBook Pro.  There are other compromises to be made such as RAM secured to the logic board which makes it impossible to upgrade.  There are quite a few very impressive design queus and specs along the way to make those initial compromises bearable.  To view the full tear down, head over to iFixit to see for yourself.