IMO, the trailer looks awesome and this movie will be awesome.
What needs to be realized is that movies and books are two completely different mediums through which a story can be expressed. People need to stop comparing between books and movies, because almost always, they will end up differently. To expect that they won't is only setting yourself up for major disappointment. Certain things can work in books that can't work in movies, and vice versa.
And so what if they decide to split the seventh book in half? IMO, it should already be a given that the studios are out to make money. And, to be honest, people ARE going to see both movies. And, each time, people will come out having had a good time. So there really is no big deal.
Treat both the books and the movies as two separate things. Some things will get lost in the translation over to a new medium. It's to be expected. Enjoy both for what they are, and don't waste your time getting pissed off over something that's not worth it.