The first trailer for Epic was really generic (which was not helped at all by the title). Although it's based off of The Leaf Men, a wonderful little book, the film looked like Arthur and the Inivisibles for the two people who remembered that it existed. The second trailer is thankfully not more of the same.
This trailer focuses on the daughter of a scientist in search of her missing father and then gets sucked up into this tiny magical world. It has the same music playing through it as the first traier though, so that's not a good sign. Look for Epic May 23rd next year.