You can find the trailer on AnimeSuki. I was hoping they were going to do a series, but a movie is better than nothing.

If your not familiar with the manga it's about a Japanese schoolboy with the ability see ghosts who gets caught up in the affairs of a powerful witch. It's by CLAMP and the manga has some cross-over with Tsubasa Resevoir Chronicles (for those following Tsubasa the witch is the dark-haired woman who gives them Mokono).

And it looks like they're adding a Tsubasa short to the movie, which should be nice. According to what I read it should be coming out August 20th, so look for it.