Spain will win the World Cup again, and I think odds of 13/2 are an insult to a side that has dominated international football for the past 6 years. There team and squad is light years ahead of the rest. The heat may be a problem for a lot of the other European sides, but it shouldn't be as much of a problem for Spain, a country that is fairly hot anyways.
There style of play aswell is suited to playing tournament football. When your playing every few days, keeping the ball and conserving energy will be key, and there will be no side that will be able to out do them on possesion.
The Germans have no chance: