So we meet. It's one thing to see the new MacBook Pro with Retina display behind thick, protective glass. It's another to see it up close and personal, where you can actually get a feel for the weight and thinness of the device. The laptop we're using is a 2.6GHz quad-core Intel Core i7 with a 3.6GHz Turbo Boost, Nvidia GeForce GT 650M graphics, 8GB DDR3L SDRAM, a massive 512GB of flash storage, and of course, the 15.4-inch 2880 x 1800 Retina display — no more turning down settings to play Diablo 3 (remains to be seen, but rest assured we'll test this when we get a moment's breath).
Like the MacBook Air, the power button has been moved in line with the keyboard. It otherwise matches the layout of the "traditional" 15-inch MacBook Pro, with speaker grills along each side and a large trackpad in the middle. The new MagSafe adapter is indeed thinner — the current one looks to be just a hair too thick for the side panel. Screen is, alas, highly reflective but incredibly crisp and bright.
And of course, here's a macro shot of the screen: