I do have to say that personally, I was iffy with the new trailer. I mean, it looks pretty and all that, but I don't get the whole "pirate ship and choo-choo train" thing. Like are they summons? Spells? Something totally new? Who the hell knows?
SE announced this game far too early. Because lets face it, probably all of the stuff we've seen up to date, is not going to make it to the final product. All this is doing is hyping up the fanboys and fangirls for something they are't going to get for years. Let's all remember that btw, this game isn't coming out for YEEEEARS.
As for what I want to see in the game? Well, new world of course. But by that I mean like ALL new worlds. Don't get me wrong, going back to Halloweentown and play with Jack Skellington makes me a happy duck, hasn't it been in practically every game? (I haven't played DDD or Coded so I wouldn't know what's in those games) I think change is a wonderful thing, so visiting places we haven't been before would be great.
I'm pretty positive by the time this game came out, Noctis and Lightning would be in it. It also depends on what other companies Disney sequesters closer to the time this game actually comes out. It's just kinda too early to judge for things you know?
All in all, while I am super stoked for this game, I'm cautious for right now since it's so early.