With how things have gone it wouldn't suprise me if a much larger number of the war criminals were to commit suicide before being taken prisoner. If that were to happen people will not have their bloodlust sated much by the trials that will happen afterward.
While the British have had a much longer history of having real war come to them than the US has even they were pretty vengeful after WWI iirc. Also, if the Germans continue to use chemical weapons, particularly if they use them in the east, there may be much more call for more dismemberment than IOTL. However, I think there would still be some form of Marshall Plan/s though with less rebuilding. The Allied goal will, likely, not so much be the punishment of the people as attempting to ensure that they do not rise again to wreak havoc. And with a lesser Soviet presence in eastern Europe there will be less worry of Germans becoming Commies, not to mention a potentially less significant/hostile Cold War.
Another thing is that with the use of gas and all of the confusion the Germans may capture much more fuel meaning that the offensive may not peter out nearly as quickly. Also, could the Germans effectively use gas on the Eastern Front as a defense to hold off the Russians?