Question: what does a 2013 Lexus GS look like attacking an autocross-style course in full camouflage? Answer: see below.
Despite the rather weak music overlaid on the video, we do get to hear some sounds of mild tire scrub in the video below, though the engine/exhaust note is too muted to make it through. Judging by the body roll in the corners and the attitude of the car as it rounds to cones, the new GS isn't going to be a shocking re-imagination of what a performance/luxury sedan is meant to be. Instead, it looks a bit soft and biased toward understeer.
We'll see the car sans the obscuring drapery soon: it makes its official debut in GS 350 form at this month's Pebble Beach Concours d'Elegance.