Article on BBC F1 page here
Crucial bits:
Both teams have the possibility of appealing against the decision.
Potential penalties for a 'minor' breach include: a reprimand; deduction of drivers' and/or constructors' championship points for the season in question;
$5m is about half a second...
Rule changes over the last 10-15 years have predominately intended to slow the cars down.
They now run 1.5 litre V6 power-units but with all the added technology [hybrid stuff] the cars still lap faster than F1 cars did 3-5 years ago.
Great documentary on aerodynamics on F1 cars from a few...