Four worlds were shown: The Land of Departure (Where young Eraqus & young Xehanort are), Twilight Town, Mount Olympus and the Tangled world. Looks beautiful.
As for gameplay, they are definitely moving forward with those ride abilities and even a revised free flow system that was originally from Dream Drop Distance. One question that has left me hanging was why Sora is wearing his DDD outfit at parts of the trailer? To access some of the power he obtained from DDD? That'd be interesting to see! The 'shooting' system looks fun as well.
And for those who haven't notice... The magic spell Areo is back!
Additionally, now I know where Xehanort supposedly obtained his Keyblade.
Holy shit, I fucking love this trailer. I'm watching it again.... AND AGAIN.
Maybe that, or maybe we'll get to play with his old outfit for a while, during the beginning? I don't know, I haven't play DDD, so maybe there's no reason why he would use his older outfit lol.
Anyways, it looks really beautiful. UE4 is such a big jump compared to 3 (you could make original looking games there with talent and effort, but it was mostly samey games). I hope, however, that the visuals improve a little in certain aspects, but I wouldn't complain at all if this is what we got.
Gameplay looks really fun. As someone who grew up with the first one (the game that marked my childhood along with, especially, FF IX) and loved the second one, but didn't actually play many spin-offs (nor liked them), I'm quite excited to see how everything fares: both the returning elements and the new ones (as well as those I haven't experienced yet. Hopefully they make a remaster of every game for PS4 right before III's launch).
And the new outfit is cool, I guess, although I actually prefer II's by a large margin. I remember the first time I saw art of Sora's black robes in a magazine, I loved them so much.
Excited about this, hopefully they actually give us more info in less time. I expect something at TGS, I guess, as well as in November. Seems like the project is going well and I trust Osaka Team, so maybe the game will actually release soon (as in, 2017 or so!).
This is just me speculating here, but I have a hunch that there may be a new feature, where you can switch outfits, just as easy as you can change what keyblade you want to wield.
Also just to note, to those who feel that Sora's hair seems different:
It is actually. Just like how Riku got a haircut, Sora's hair is progressively changing as well, to show his maturing since the past games. The spikes at the top have been trimmed, the hair in the back has been slightly groomed, and his bangs have grown a little bit longer and are also slightly groomed. It's still bed hair, but neater in a subtle way.