The above VFX featurette focuses a lot on the motion capture animation behind the trolls in the film as well as the big caverns full of goblins. As for the sound featurette after the cut, it's a broad look at creating the sound and score for the film. I'm assuming the eventual featurettes on the DVD/Blu-ray for The Hobbit movies will be meatier and go into more particulars.
The Hobbit: The Desolation of Smaug and The Hobbit: There and Back Again will be out next December and the December after that. Then in 2015, Peter Jackson will release a new Tintin film, which he shoots the motion capture for some time next year.
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Flixist's previous coverage: The Hobbit: An Unexpected Journey