It seems that Square will be releasing new information about AC soon. This is an article that appeared on Advent Children.net:

Square-Enix are planning various promotions for AC in Japan in the run up to its September release.

During July there is going to be a 'song tie-in' (perhaps a theme song for the film), as well as articles in magazines (such as W-Jump) introducing parts of the story and the setting. During August there'll be more magazine articles in gaming magazines like Dorimaga releasing information about the characters, and TV commercials near the release date.

Other plans include special events in Japan and the US on 30th~31st July, advertisements around Shibuya in Tokyo, and the release of books and magazines.

Source: Advent Children.net

I can't wait to hear the song! The lyrics should give a big hint as to what happens in AC.

oh the song!! Yes please!!! I can't wait either!!! *^__^*

Oh september...hurry up and come!!!! :cleris:

I'm looking forward to the music, too, but I'm even more excited to hear more about the story and characters! This is supposed to start happening in July, so it's almost here! :fangirl:

I can't wait too!We can get new info,or scans at least.

The theme for AC someone will be singing it? I really can't wait for the lyrics then.

It's not confirmed to be a theme song, it just might be ^^;