People seem to be forgetting that Klopp was trying to slightly change the way Dortmund played in their last season, so he may have something quite different in mind for us if/when he takes over. Assuming we'll play this 'gegenpress' is like assuming he's going to raid Dortmund for players; it may happy but we shouldn't take it for granted.
Certainly without a pre-season to implement his ideas he's not going to have the fitness levels to put in place a high-pressing system immediately, and probably not until next season. The German League also has a winter break, which is therefore more forgiving fitness-wise.
Was he trying to change or was it forced on him because they had so many problems? It sounds a bit familiar really.