That can be screwy sometimes. This year we Benicio Del Toro nominated for best actor by the Screen Actors Guild and for best supporting actor by the Oscars. In the early years, the winners names leaked out early. So they've finally had to bring accountants in to keep the secret Hollywood couldn't keep around the 1940's. Those kinds of movies are really best seen in theatres.
Nobody knows the answer.
He has never hosted before, and he better not make the mistake David Letterman made a few years ago. Be funny, but don't be too cynical. It depends on if you believe the critics or not. So that tells us it is at least worthy. It is going to be the most paranoid Oscars ever.