I think these are real, not necessarily photos, but if they are I reckon that the wallpaper was added on afterwards...
Or they could be mockups for marketing. Do Apple sometime mock images up for the marketing rather than take photos of them?
I think they are real and that the Macbook is bigger because they are going to position the MacBook air even more for people who want a small laptop.
I think the black bezel is nice, it's amazing how often people complain when Apple change stuff, nobody moans about the Nano Phatty anymore or the new keyboard, most of them got used to it.