Weta's put a huge amount of concept art from The Battle of the Five Armies. The level of detail going into the costumes, weapons, and fight scenes is simply incredible.
In Weta's video, you can see ideas go from concept art to practical and visual effects. No matter what else The Hobbit is, it looks amazing:
Below is just a selection of concept art pieces, many more are available at Weta's website.
[via Comic Book Movie]