Partners changed. But propably no change in Germanys GWOT Operations.

Few foreign policy shifts expected from new German coalition
Things are unlikely to change, however, as both Merkel's conservatives and Westerwelle's liberals support Germany's involvement in Afghanistan. Westerwelle himself has made it clear that he opposes widening the role of German troops deployed against the Taliban, a consistent irritant to US military planners who regularly called on the previous government to commit Bundeswehr troops to combat operations. It is therefore unlikely that the new coalition will cave in to increased calls from the US and other NATO partners to move German troops into more dangerous areas of Afghanistan.
Though I disagree with this statement:

"In fact the new government will find it marginally easier to pursue the policy of the previous government. The Afghanistan mission is widely unpopular within the German electorate and it was particularly hard for the Social Democrats with their pacifist traditions to defend Germany’s involvement. It should be easier for the CDU/CSU-FDP coalition government to sustain Germany’s engagement even if it remains a position which is unpopular at home and with a large part of their own electorate."
If the socialdemocrats move to an anti-war position it will be much harder to pursue the current GWOT policy. An anti-war stance by the SPD would give a large part of the german electorat a more serious voting alternative to end the mission than the far-left "Linke". Depending on how the war in Afghanistan develops, rising election chances of the SPD could force the new goverment to be even more reculant about the fighting deployments of the german troops, to put more pressure on NATO to end the mission or could even lead to a retreat of the german troops.
Then again this is a rather big "if" and I would hardly describe the SPD as "pacifist". In any case after that defeat the SPD will have its hands full with internal party politics for quite a time.