To what extent did the teams know about this year's tyre characteristics?
I know they tested on the Friday in Brazil. As has been said, it won't be good if some teams have a car totally at odds with the tyres, but I would be surprised if it was as 'random' as last year.
Edit: on which note, Button says this:
http://www.autosport.com/news/report...ce=mostpopular