I''ve noticed a few little features on the rMBP that improve on the old unibody design, and I'm wondering if there are more that I missed. 1. There is a rubber o-ring around the display, about 1-2mm thick. This keeps the display from making contact with the keyboard when closed, so no more finger grease key imprints on the screen. 2. It appears to use the eyesight camera as an ambient light sensor. For one thing, it turns off the keyboard backlight in a well lit room (when you press the backlight brightness buttons, you see a little padlock). Covering the eyesight with my finger turns the backlight on again, so that is the sensor. 3. Now that there is no glass in front of the screen the image appears to be right on the screen surface, rather than under it. anyone notice anything else?