The Lego movie is awesome! And now you can see just how much work went into that awesome. This 7 minute behind the scenes look into the making of the Lego Movie is almost completely spoiler free. The animation studio, Animal Logic, put a whole lot of love into this project. Starting from Lego sets, they built and familiarized themselves with Lego. Then built concept models that were then digitized with what looks like the Lego Digital Designer (LDD). They then animated these models in the software. All of this took years of work, which paid off!
It looks like the video below is actually a cut of version of an fxguide article. The embedded version below mostly removed the interview portions. If you want to see the full version you can read the article, Brick-by-brick: how Animal Logic crafted The LEGO Movie, here: http://www.fxguide.com/featured/brick-by-brick-how-animal-logic-crafted-the-lego-movie/ and download the full 30 minute video, fxguidetv #186: The LEGO Movie, here: http://www.fxguide.com/fxguidetv/fxguidetv-186-the-lego-movie/
YouTube link: http://youtu.be/iiL5U-yksa8