They just released the first trailer for the movie, oh man just a few second trailer was just beutiful... it was breathtaking. Makoto Shinkai's works are always so beutifully done. I cannot wait for this film, which is showing in theaters next year (May 2011).
You can see the preview here ----> Trailer for Hoshi o Ou Kodomo
Youtube just put up their HD version
Here are some screen shots from the trailer'