It is said that Scala ad Caelum was a seat of power for keyblade wielders. So a place for the government and/or leaders of the keyblade wielders.  


At the middle of this place sits the main building/castle of government
and around it, can be seen the peripheral buildings of government

 

I think the area may look somewhat like this (below). The main building/castle in the middle, surrounded by 12 peripheral buildings/castles. Connecting them all are cables, symbolizing the oneness of the place.  

In each castle sits a different keyblade leader. Working together, they makeup the leadership for the keyblade wielders.

Xehanort wants total control. As he sits in the central castle, he seats each of his other selves to the surrounding castles. Together as one.

Continuing with how the world looks, it may not always look the way it is shown in the trailer.
Perhaps during our visit there, the sky turns to night

Maybe some of the peripheral buildings distort or change due to the dark presence of Xehanort and his other selves.
Maybe the whole place distorts and changes because of Xehanort and his 12 others.

 

Lastly, the concept art of kh2's final boss is often brought up when talking about kh3's final boss.
Maybe the 13 corrupted buildings form to create some sort of giant Goat-esque being as part of the final boss.

How do y'all think the world will look and play out in the game? do you think we'll fight 12 of xehanort's selves? Do you think each one defeated will save one of our friends, totaling 12 friends seen in the cover of kh3? Connecting to the DDD opening, do you think books have any significance in this world? Do you think we will find one book inside each of the 12 surrounding castles corresponding to our 12 friends? Leave your thoughts

 

Edited December 21, 20186 yr by LostArtis

I wonder if this world is similar to the End of the World from the KH1 game, in which all of the worlds got sucked into the Realm of Darkness and became XH's dominion.  It would be interesting.  Perhaps all the buildings could be representations of all the worlds there are and all the ones that Sora has went to, did visit and has yet to visit.  Sort of like past, present and future collide and all the thirteen is a representation of a world.  Larxene for Frozen, YX for Toybox, Luxord for Pirates of the Carribean, Marluxia for Rapunzel's world and so on.

2 minutes ago, ienzo628 said:

I wonder if this world is similar to the End of the World from the KH1 game, in which all of the worlds got sucked into the Realm of Darkness and became XH's dominion.  It would be interesting.  Perhaps all the buildings could be representations of all the worlds there are and all the ones that Sora has went to, did visit and has yet to visit.  Sort of like past, present and future collide and all the thirteen is a representation of a world.  Larxene for Frozen, YX for Toybox, Luxord for Pirates of the Carribean, Marluxia for Rapunzel's world and so on.

 and inside there are some rooms of different worlds like in kh1?

4 minutes ago, LostArtis said:

 and inside there are some rooms of different worlds like in kh1?

Could be, though I doubt they are explicable.