I was only able to watch it once, so I'm likely to forget things.
Castle Oblivion is back, Terra appears in it in high quality graphics running through a hall, the trailer opens with Ven in the center of a room sitting lopsided lihea doll, and a scene with Aqua in front of the castle with what looks like a post frozen Ven wrapped up in a white cloth.
The last scene is KH2 Sora sitting on the paopu tree alone watching the sunset.
Axel/Lea and Saix/? appear in Radiant Gardens, they look about 13 or so, Ven is with them and he looks older than them.
Scenes of Terra absorbed in darkness, Aqua calling herself Master Aqua, Terra giving Ven a fancy wooden keyblade that resembles Vanitas keyblade.
A gameplay scene where Aqua fights Vanitas and a cutscene where Vanitas lays defeated and Aqua tries to remove his mask but before she can he quivers and lets out an extremely shrill laugh. Later Master Xehanort is questioning Vanitas about Ven and he is holding his mask at his hip but the camera angle avoids his face.
