Well, this year's E3 was AWESOME. We got some information about birth by sleep like the new secret boss that will probably be TWICE as hard as sephiroth, Lingering sentiment, and Vanitas lingering sentiment put together. When i fight it I can't wait to get angry and start wanting to say " how did i lose, that's no fair, this boss teleports everywhere I bet the other KH players are going insane like me" can't wait for that lol you just gotta love getting angry at the hardest bosses ah memories. And the best part it's good to see Pit back in the game, " sorry to keep you waiting" that line made me smile so hard, and i can't wait for the new Zelda game and the new Sonic colors game. I also wonder what this new kingdom hearts 3D game will be about. But all i can say is, it is not a remake or a dream of what Sora was thinking while he was sleep. Seriously that's the most stupidest idea i ever a KH fan can think, no offense people.

KingdomHearts12 about the new Boss, it would not be as hard as Sephiroth, Lingering Sentiment and Vantias combined. Also Sephiroth is weaker then The Unknown Enemy from KHFM.

Also the footage of the boss could also have been on The new Mode or Proud. I Doubt it was on a Easy Mode.

Also that was just a trailer. He could get a lot weaker before the Games Finished.

Also note it would have been a test or just a promo for it, making people think he will be insanely hard.

 

So to wrap things up he could easily change before the games release.