LOST to answer 3 BIG questions

This week's Newsweek has an article where Lost producer Carlton Cuse promises the season finale will answer 3 BIG questions.

1 - Why did the plane crash?

2 - What happens if the button isn't pushed?

3 - What's going on with Michael and Walt?

Knowing the answers to those 3 questions will be nice, but I'd rather have some questions from season 1 answered. Where did the polar bear come from? What were those strange, Godzilla-like noises coming from the jungle in the pilot? What is the mysterious black smoke? Somehow I feel like we'll never know the answers to those and many other similar questions...