Though the new MacBook Pro with Retina display is thinner obviously than its non-retinal Pro counterpart, what's more interesting to us is that Apple also claims it's "as thin as MacBook Air." We sized it up with our 13-inch MacBook Air (not this year's model), and in fact, the new MacBook Pro with Retina display is both thinner and thicker at parts — it all depends on that patented wedge. And that goes for both lid open and closed.
As for the new MagSafe, while we haven't exactly pulled out a ruler, it looks from the naked eye to have the exact same five-dot configuration — what's different now is the surrounding cover, which is both thinner and wider. While it looks good, obviously you lose backwards compatibility here. The 15.4-inch screen is, of course, much crisper and more pixel-dense than the Air, our older machine here has an anti-glare screen that is definitely easier to use against direct light.