They are not sure yet because the first movie, Eragon, tanked in the box office.
Not all movies start out as books but many of them do
Yes, they already have. All the books have been made into movies. There will be no more books and no more movies.
All seven of the Harry Potter books have been made into movies.
there was Bella's lullaby. you can also get all the songs off the soundtrack.
All the books.
ALL
probably all of them.
yes.
If the movies get good reviews, yes they will all be made into movies.
yes
Yes it is legal, as long as you have a page in the book that lists all the books/movies that you've mentioned
Titles are an exception to copyright. Music, books and movies are able to use titles that have already been used.