Looks pretty enjoyable. I remember being a bit put off when the some of the images of the characters were first released because they looked so similar to Tangled, but it doesn't really bother me much now - I don't think they necessarily need to reinvent character design for every movie (I could definitely do without the reindeer acting like a dog, though).
With the trailer focusing so much on comedy, which seems to be typical for (American) trailers for animated movies, it's hard to tell how the story will be. I think I've read that there'll be a focus on the dynamic between the two sisters, so it's possible the movie isn't as similar to Tangled as the trailer may indicate. Also, Disney certainly seems intent on not showing off how it's a musical.