Currently, not much is known about the Five Nights at Freddy's movie. It has been confirmed that Warner Brothers bought the rights for it, and that they intend to slightly stray from the plot of the games, but not much else is known. Obviously, since the rights were only very recently purchased, not much about the film has been established.
Many fans have also been creating their own trailers and have been speculating many theories as to the plot of the movie. Some theories include that the film may focus more on the Purple Guy, or the Phone Guy. But, at such an early stage in the movie's creation, nothing is for sure.