With the new scans that have been released, I think there are a couple of details that are worth noting in a new theory. The biggest basis for this theory is that both Pinnochio and Jimmeny Criket are seen with both Sora and Riku. Why does that matter? Because both those characters have already met Sora and Riku. There is one scan where Pinnochio is talking to Riku, but Riku looks absolutely ashamed of himself. I believe Riku is remembering how badly he treated Pinnochio in KH1. Pinnochio himself isn't the least bit phased by Riku in the scan. This leads me to believe that Pinnochio either doesn't remeber or hasn't expirianced the events in KH1. Well, if the worlds are supposed to be submerged in sleep, then why are there characters present that we already know aren't there? I eventually came to the conclusion that if worlds had hearts, theoreticaly they could have memories as well. Since sleep and dreams are directly connected to memories, the worlds they traverse could literally the memories of the worlds themselves. Or, at least, artificial recreations of those memories. Now, how this fits in with Neku... to be honest I'm not entirely sure. My best guess is that since he has the pin for mind reading, he could theoretically enter the mind/memories of a person/world and influence his/it's dreams. Since Neku already knows both who Sora is and what the Dream Eaters are in the trailer, I suppose Neku could be tasked with a mission to help Sora through his dreams or do something in the world for the Game. We already know that Neku had some sort of mission when he first met Sora because he had the timer on his hand. Now that I think about it, this is really two theories not one but oh well.

It's worth considering.

I think your on the right track, but Neku will probably only be in Traverse Town. Square won't let him venture out to different worlds with Sora.

Okay! Well, three new scans have surfaced a little less than a month after I wrote the theory above, so to keep from repeating myself for anyone who read the origional theory, I decided to simply update the one already written with the information from the new scans. I actually debated whether or not to simply wait after Jump Festa is over, but I figure I can always update a theory similarly to what I'm doing now. Anyway onward to the theory. The new world that is announced is a Three Musketeers world. Now building on the theory above, I believe that this is a recreation of the current Disney Castles memories, but what's interesting is that the "sleeping worlds" are not necissarily the ones that were in the realm of darkness. In the GameInformer article, it stated that "Sora and Riku must save several Disney-themed worlds from a sleep stasis". Now the question is what is a sleep status, and what happens when that world is "awakend". Before the anouncement, it was thought that the worlds would resurface in the "awake" realm of light, or at least that was my thought process. Now that one of the sleeping worlds in a world that's already in the realm of light (a very important world at that), how can it be awakeded? This leads me back to memories. Disney Castle has gone through multiple iterations or world identities as I'll reffer to it here. For instance both Timeless River and Disney Town would be world identities for the current Disney Castle. However, when Sora, Donald, and Goofy go back to the Timeless River, they do not figure out that it's Disney Castle in the past for a really long time. This implies that they don't remember much, if anything, about that world identity. This could be how the worlds are "sleeping". If Country of the Musketeers was a separate world identity, it might not be remebered by the people who were there and therefore be "asleep". You could say the same thing about Traverse Town as well. With that big Coloseum that they have, Traverse Town might have had an Olympus Coloseum esque identity once if Olympus Coloseum had about two tons of neon covering it. When these world worlds are awakend, they would be remembered by residents of that world. A cool possibility that I think would work would be with Hollow Bastion because it already had another identity, Radient Garden. If this theory comes true then Sora and Riku could be running around the Apprentice Xehanort time phrame in Radient Garden. This might explain the one scene at the end on the trailer from TGS. Another option would be Castle Oblivion in it's Land of Departure form. There could be infinite possibilities if that happened especially since 3d deals with Sora's data.

 

-Sidenote- In the scans, it shows a boat sailing on whater. It also shows Sora, Mickey, Donald, and Goofy on a boat. The only place we know of that has ever had water was the Timeless River, so that might be what they are sailing down on in the game. What's strange is that the boat is a classic sailed ship. In Timeless River, the boat they used was a steam ship. Either Country of the Musketeers is before Timeless River, or society in that world progresses and regresses in really strange ways.

You know, the whole "awakening thing" could be more than remembering worlds, it could be restoring their original states, and it could also mean rescuing people. i think you know where I'm going with this.

Both Land of Departure AND Radiant Garden are most likely in KH3D, and I wouldn't doubt, the Keyblade Graveyard.

My sources? Those are worlds no one even knew about until recently (5 years for us, not for them lol)

Those are worlds that are forgotten and that aren't in Darkness, they don't exist. Your whole theory DOES make sense. Approved by me!