They better not. That is an important scene(to me at least). It will be stupid if Remus tells them Tonks is pregnant any other way. As for the other scenes I don't know but because they r who they r they will probably cut out his little scenes.
Does anyone remember that scene at the Burrow in the HBP movie in which Lupin alisema to Harry "If we start fighting amongst ourselves, we're doomed"? IMO, that line was foreshadowing to the fight that will take place between them at Grimmauld Place in DH 1.