Peter Jackson has opted out of calling the Hobbit finale The Hobbit: There and Back Again to Battle of Five Armies. Jackson said:

“When we did the premiere trip late last year, I had a quiet conversation with the studio about the idea of revisiting the title. We decided to keep an open mind until a cut of the film was ready to look at. We reached that point last week, and after viewing the movie, we all agreed there is now one title that feels completely appropriate.” 

I am imagining what the critics would have made of the original title…

Source: Hero Complex, Facebook