So hang on a minute.
Bigois present 12 months ago...car in development.
Bigois leaves...development stalled.
Windtunnel upgraded...development stalled.
Elliott joins the fray...development stalled until he can get up and running with what's been designed before he joined.
That is just assuming it's been a continuous development stage. But of course it hasn't been.
Reasons?
1. Mercedes where still chasing the DDRS avenue well after the chinese GP which was in April. So assuming they still though it was prudent the W04 will have had it's concept in line with DDRS usage. In the end it was banned(the Mercedes iteration anyway.) And the the rewards weren't as big as hoped.
2. Coanda exhaust using teams showed big gains in season. Mercedes hadn't covered this base whilst exploring the DDRS avenues.
These 2 factors alone mean whatever Mercedes had on the drawing board 12 months ago, has gone over so many changes it is probably unrecognisable.
The W04 is said to be all new, so as I have mentioned before I don't expect any familial look to the W01/02/03. Possibly one or 2 elements, as can be expected, but certainly a different car altogether.
It has to be. There where too many issues in the 2nd half of the season for the W04 to have much in common with the 03.
Coanda exhausts will be expected.
The rear of the car will be different, beyond the suspension geometries.
And I expect a far more developed front wing, something DDRS hampered them with throughout 2012.