As of right now, there are going to be 4, a movie for each book in the series. But theres a rumor going around they may 스플릿, 분할 Breaking Dawn into 2 영화 just like Harry Potter 7... Its not definate though. :P
there is currently two. three in june. and then there will be breaking dawn. but breaking dawn is so long as 당신 will know if 당신 have read it, so film producers are thinking of breaking the film into two but that will be decided later