Trailers:

Kingdom Hearts: Coded:
-In the trailer, Kairi is shown holding her hand up to the moon. The scene then fades to Riku.
-A new mode has been announced for the game, called "High Speed Mode".
-Coded is set for the FOMA model mobile phone. What is FOMA? Check the Wiki Page!

Kingdom Hearts: Birth By Sleep:
-Ven wields his Keyblade with his left hand.
-Scenes featuring combat with Terra.
-Ven is shown with Alladin.
-Donald is shown wearing his normal clothes. [From Kingdom Hearts beginning?] and Mickey is with Yensid in his clothes from the secret ending.
-A new completely black Keyblade is shown, a new enemy?

Kingdom Hearts: 358/2 Days:
-A scene is shown where Organization Member XIV (14) is shown assisting Roxas and Axel after they are startled by heartless.
-Mickey, donning his coat is seen looking towards the woods of Twilight Town.
-Roxas is seen with Alladin and Jasmine.

Demo Impressions:

Kingdom Hearts: 358/2 Days::
-Multiplayer mode lets you choose from Roxas, Axel, Xigbar and Saix.
-The Multiplayer Character Selection Screen shows the Organization Members sitting down in their chairs. [What a nice touch!]
-Roxas is only able to use three hit combos in this demo.
-Axel plays notably different from Roxas "feel" wise.The demo player was relieved when he/she was able to use Axel's fire attacks.
-The playable world in the Demo is Twilight Town. The fight consists of four small wizards, one Fat Body, and four Shadows. Afterwards the player fights a Dark Side boss.
-The objection of the mission is to defeat the Dark Side.
-When the mission is cleared you are taken to the record screen.