I believe in Germany against Netherlands it will depend on what tactics van Marweik will choose. Hope he won't play as he tried to play against Denmark. Hope he will place at least two forwards on the field from the begining. It would be great to see van Persie with Huntelaar from the begining. They didn't have much chance to play together in the first game, so maybe they will show us some interesting things in the upcoming game, but I'm afraid that va Marweik won't do this...
On the other hand Germany is in a great condition and I think that they will play better than in the game against Portugal for several reasons. First they already have 3 points, and then they also had a better gameplay in the first match and of course its quite an impoirtant game for them when they can asure their first place in the group.

But I believe Germany will use counterattacks for the most part as they don't have a need to rush. On the other hand I believe that Netherlands will try to control the ball and try to attack from the begining to score early goal.
Denmark - Portugal... Well I see it as it was when Denmark played against Netherlands. They played on counterattacks and dutch controlled the ball and made tons of attacks. Still |believe Portugal has a good chance of victory if they score an early goal. At this point Denmark might go forward and try to get an equaliser, but it may lead to 2-0 or even higher score. Everything will also depend on Cristiano's and Nani's mood.