Forecast is for heavy rain at race time. Almost none of the drivers have ever tried the new Pirrelli wet tires, so could be a total crapshoot.
After first 2 practice sessions Red Bull (Vettel and Webber) and McLaren (Hamilton and Button) have been around 1 second better than Ferrari (Alonso and Massa), Mercedes (Schumacher and Rosberg) and Renault (Heidfeld and Petrov).
Sauber (Koybayashi and Perez) and Williams (Barrichello and Maldonado) are within a second behind again.
Vettel +140
Hamilton +530
Webber +580
Button +1000
Alonso +2000
Schumacher +4500
Rosberg +6000
Massa +7000
Petrov +8500
Heidfeld +9000
Barrichello +21000
Koybayashi +25000
Think I will sprinkle a little on Alonso and Schumacher in the hope rain mixes things up.
Put a half unit on Hamilton to take pole position +1100. But only because I think it's a good price, not holding my breath for him to out-qualify both Red Bulls.