Wow...
That was an incredibly good preview. It can stand alone its so good.
The movie is sweet, and touching. A serious feeling movie with a touch of sweet humor to it. Nothing that makes you want to laugh out loud or anything, this is the sort of movie that makes you want to lean back and smile. I cannot wait for the full movie, as this by itself is going to be going into my favorites listing. A rare thing considering I usually hate previews.
The graphics were incredible. Not only are the drawings highly well done, but the animation included lots of frames of movement and flowed very well.
All in all, this little preview touched my emotions, and I was extremely impressed by its overall effect. I'll be sure to watch the real thing when it comes out. Good luck.