I really don't remember old stuff on Thursday and new stuff on Friday in a weekend. I remember new stuff put on the car on Thursday. What is the point to hide it?
If they would have anything radical, I don't think it would be on the rack in front of the garage. Nothing visually radical coming though, at least not on the parts on the picture. They have said they are concentrating on tyres, so upgrades should not be visually different, at least not strikingly so. Merc is not a marketing team, putting new front wings and gadgets on show is just not their style. I don't think that they have any serious aero problems, suitable tracks for Merc are coming up, with increased race pace, anything is possible. The car is developed, not all upgrades are visually outstanding, if the car can be made competitive without major changes to the bodywork, I don't see any reason to change things just for the sake of it. Only thing that would stand out visually is changing the exhaust config, but, as it has been stated many times, the exhausts are vastly overrated by now, there is no diffuser war anymore. The secret is in the small details now because of the tyres provided this year, so I do not expect anything too different from what we saw already. If the car is more competitive, I don't really care either. Let's see from tomorrow, I hardly think they are lying or exaggerating about developments, they never have. Plus, to all the nay-sayers about development: they have basically re-built the car since race one, and barely anyone noticed it, its not like they are sitting on their behinds.