There is something fishy about Fischers step now. Either there are some strong movements in the Green party leadership to go with the CDU and he doesn´t want to get his hands dirty negotiating with Merkel (it would be the political death of the Greens to go with a CDU/FDP coalition - TheLeft would have a good laugh and 8% more in the next election), or he knows that Schroeder already has an about fixed deal with some CDU leaders.
Ahhh - finally German politics are getting a bit more interesting. Moon of Alabama