Nothing.
A repeat of Monaco wont happen... You can overtake here without too much difficulty.
At Monaco Ron prevented both drivers trying to race each other because the risk was far too great, here, the risk is so much lower, still high, but thats racing.
Like in Monaco im sure there will be an agreement abotu the start procedure, but from then on, I'd say they will be free to race.
What will be interesting to see is whether Nick holds the two Ferraris up, or if he can keep a steady gap.
And also its obvious that the super softs are not the tyre to be on... so how will the teams go about strategys knowing after not many laps, those tyres are hell to be racing on.
"Trulli was slowing down like he wanted to have a picnic" LOL