I think this will be still a 50/50 game.
It doesn´t matter who is injured and what happened to the teams in the last 2 weeks.
At this stage, in the semifinals, it was nearly always a single error deciding the game and both Germany as well as Brazil are capable of producing it.
If you look into the semi finals of the last world cups you see that they were all close ones, even when you would have thought there is a clear favourite, the results were in 11 out of 12 times within 1 goal difference or less (penalties) and if you look at the only other one, the 0:2 of Germany in 2006 vs italy most will agree that this one could have gone either way aswell.
Worldcup semifinals since 1990:
2010:
Uruguay - Netherlands 2:3
Germany - Spain 0:1
2006:
Germany - italy 0-2
Portugal - France 0-1
2002:
Germany - South Korea 1:0
Brazil - Turkey 1:0
1998:
Brazil - Netherlands 1-1 pen 4-2
France - Croatia 2-1
1994
Sweden - Brazil 0:1
Bulgaria - Italy 1:2
1990
Argentina - Italy 1:1 pen 4-3
Werst Germany - England 1:1 pen 4:3