From THR:
Sources close to the production of The Hobbit say the filmmaker has concluded that he wants to turn his upcoming two-film adaptation of the J.R.R. Tolkien epic into a trilogy. That would require additional shooting that sources say could take place next summer for about two months in New Zealand.
I mean, if I'm wrong, I don't mind it beocming a trilogy, because I absolutely love LOTR, but LOTR had three clear sections.