3. Brand New Keyblades
This one was a little hard to spot with how much action was in this trailer, but we did get a glimpse at the Keyblades for both the Monster's Inc and Tangled worlds.
The first Keyblade we get to see is the new Monster's Inc one, which features a mechanical design with a Monster's Incorporated helmet at the top and a door at the base. The Boo keychain is a nice touch. We also get to see that when attacking, the Monster's Inc Keyblade produces little monster stars, which is a really cool little detail.
Tangled's Keyblade seems to be Rapunzel's tower, with the symbol of Corona, a sun, as the keychain. We don't get to see much of this Keyblade, but it's nice to even get a glimpse of it.
This trailer continues the weird trend of featuring the world Keyblades during early gameplay of the world itself, which could indicate a change from previous games where you can only use the Keyblade after completing a world for the first time.