Thoughts:
-Well, that trailer is the quick way to catapult to being my fourth most wanted game just a couple days after being announced. Potential for third, even.
-So judging by voices and all that vague personality info released before, it seems we've got a wussy male protagonist and an assertive or perhaps domineering female. This is fine by me, and actually probably more than fine--I like the idea.
-The overworld and towns look close to Tales of Symphonia, to me. Great job. Battles, though, not so much. Of course, in the heat of a good battle (whether in an RPG or fighting game or anything else) I tend to not notice graphics anyway, so it might be a moot point.
-Love the music, but I hope the overall game isn't quite as serious as this one theme would suggest. I'm guessing it won't be, considering we're dealing with two 15-year-old protagonists, but eh... Serious plots tend to fall apart for me much more often than not, unless the game they're in has Baten Kaitos in the title.