Well here is the link to begin with FINAL FANTASY XIII

Just click on "Trailers" and you will see that the newest one is Trailer 3, click on the format and watch. I found it to be very good. It starts off with Snowe and Serah riding on a "Air Bike" watching some fireworks and goes from there. You catch a glimpse of Sazh's summon, that as I said in the other thread is actually not Ifrit, and you see Lightning dish out some nice damage with some huge swords riding Sleipnir. There are new story scenese that are revealed unless you know Japanese you won't get much. The trailer also shows the I'Cie that is working for Cocoon. If I'm not mistaken you are able to hear the theme song as well, which I just found out is not done by Uematsu; Uematsu gave it to Hamauzu because Uematsu was selected to compose FF XIV - this marks the first time a Final Fantasy game will not have a single piece of music from him.

Square Enix Music Online :: Video Game Music News This is the link to confirm that Uematsu is not working on FF XIII.