I don't think Brazil will be as hard to beat as they were in the last World Cup. The heat and humidity won't be as much in their favour this time, which allowed them almost total control of games at the slower pace. In the QF for example our players were shattered before half time, meaning the 1 man advantage was negated. The slow slow quick style they play conserves a lot of energy but with a European summer it should be that European teams have a better chance of keeping the pace up when needed.
Just a shame that they didn't send on Umaga, armed with a handbag...