I think we will all watch it..lol
But i think they will probably cut out the Quidditch part. I dont think they would have if Harry hadnt landed himslef in detetion because that would lead to the kiss with Ginny. Which tells u that they r together. But in the certain circumstances then i think they will cut it comepletly. And i dont think that they will cut out the parts of the pensieve because there are to many crucial points. If they are goin to break up the last movie then i dont thik they will skim over to many parts like of those with harry n dumbledore