OK I've just popped over from TNF. Up until the mid-70's F1 cars could look radically different, plenty of scope within the regs to produce something unusual and potentially quicker than the run-of-the-mill stuff, often dependent on what configuration of engine you were using. So most designs were instantly recognisable as belonging to a specific marque.
The argument these days is that you could take the 10 F1 team cars at launch, spray them all white and even the most enthusiastic of us would struggle to identify the different team cars. Basically tighter regs = homogenised designs.
Looking back, I reckon the Williams FW26 in 2004 was the last "launch car" that looked distinctly different from its contemporaries.
So, any surprises this year ??