http://insomnia.ac/archive/games/xbox360/t/trustybell/
This recently got a release date (June 14th), and a nice 720p trailer is now avaliable on the Japanese Live network (it's more or less the same as the one shown at TGS, but the higher quality makes it worth watching again). I uploaded a compressed version of it to the archive page for those without Japanese Live accounts.
Game looks great -- hope it turns out better than Blue Dragon.