I'm pretty sure that is the RB11, testing at Jerez. Obviously it'll have more developments by the time it gets to Melbourne, like all the other cars but I see little point in camouflaging a hybrid RB10
Pretty decent aesthetics across the field so far (Sauber excepted).
Can't really tell much from the running so far except that Merc are testing their car beyond endurance and to destruction whilst Ferrari seem to be aiming to win what Ron Dennis would call the 'winter championships'. Sauber seem to be going for morale boosting times as well, but after last year they kind of need that.
Williams simply seem to be working diligently through a programme, like last year they aren't bothering even trying for lap-times until the next tests.
Respectable recovery by Lotus after the rather clumsy fail of not getting the car ready in time to ship out for day one, but at least they're there and running. Force India's absence is too suspicious. I don't buy this longer development thing, just too risky with such limited testing available.