It's unclear exactly which G-Class model this is, though our best guess is that it's the standard G550. (Those wheels look much too tame for an AMG model.) The G-Wagen's overall design hasn't changed (that's fine, we like it just the way it is), but updates for the 2013 model year include LED running lamps under the headlights and redesigned mirrors.
Word on the street is that the G-Class will feature a reworked interior for 2013, including a new instrument panel, steering wheel and consoles. The big news, however, is that the G55 AMG will now make use of Merc's 5.5-liter twin-turbo V8 found in the other AMG models, though it's unclear if its nomenclature will be altered. You know, because G63 AMG absolutely makes sense.
Mum's the word on when the official G-Class details will be released, but since the car appears to be finished and already posing for photos, we don't expect Mercedes-Benz to hold off for too much longer.