According to Comic Book Movie on Dec. 14, in a short video interview with the cast from "The Hobbit: The Desolation of Smaug" gave a slight revelation of the emotional build up to the final installment of "The Hobbit: There and Back Again". Jackson declares that the final sequel will be the "most emotional of the three".
The second film, which has a rather strong cliffhanger of an ending, gives an idea to audiences of what to expect in the third film and the enormity of how it's all going to end. Benedict Cumberbatch explained that the script gets more "pacier and intense" as the film progresses. There is a tendency to become "invested" in characters.
Jackson explained that pretty much every conflict among the characters that have established some kind of an association with one another winds up "playing it out" in the third film and Luke Evans explains that the "intensity builds through the second film".
Go find out how intense it gets in Peter Jackson's final installment of Peter Jackson's "The Hobbit: There and Back Again".