Below are quick notes of things seen in the trailer that can be considered as new information or interesting:

- There are scenes of Namine speaking with the blonde haired kid.
- Various scenes featuring the blonde haired kid
- Scene of Kairi speaking with Selphie
- Scene of Sora fusing with Donald in which Sora's custome changes to blue.
- Gummi Ship scenes

More of the following worlds:

- Halloween Town
- Beast's Castle
- Oylmpus Coliseum

The actual trailer has not been released yet. It should be arriving soon.
YES!