Yeah yeah yeah....the usual "jinx it" predictions.
I think any team who tops their form before the WC will slowly lose it, while teams with bad form will gain it slowly and raise their game to reach top form right at the perfect stage in the WC when they need it.
My vote goes to Argentina. They will be a whole another team to watch in later stages in the WC! The Germans will also dominate! Brazil, even though they've been good, they are far from being a WC winning team! At best, they may reach the quarter or semi-final, losing to France or a team like that.