How do you know he won't include the scouring of the Shire - to me that is one of the best parts. That would be a disappointment indeed - please... say it ain't so! WHat info do you have on it??!!
Jackson has said on several occasions that all of that would be cut from the movie - the theatrical release, at any rate.
2) Peter Jackson said that the scenes of The Shire, which Frodo sees in Galadriel's Mirror, showing what would happen if Frodo should fail, were intended as an homage to The Scouring of the Shire, since Peter Jackson would not be including it in the film. Hence, you sort of have already seen The Scouring of the Shire, in Galadriel's mirror.