1) what will Sauron looks like?
Sauron will look awesome and scary.
2) will we see scenes or things are very different to the book? (e.g. Arwen in the Fellowship or something like this)
Peter's staying pretty faithful to the books.
3) when will we see the first official pics of the sets and actors?
I think you'll see set pics after the fall of this year
I trust in you ;-)
Danke Mr. Deluca, daß sie sich die Zeit für die Fans genommen haben!