Prediction- we won't see Kingdom Hearts 3 until 2018, at the earliest

[VanceIX]

KingdomHeartsFan said:

They are not making an engine from the ground up for KH3, they are using the luminous engine that was already done.  Also ofc there is gonna be new worlds, there was new worlds in KH2, that didn't make it take 6 years to develop.  I'll say it again since you keep avoiding the question, what specifically is gonna take this game 6 years to develop.

Even Nomura thinks that they announced the game too early.

http://gematsu.com/2013/06/kingdom-hearts-iii-announced-a-little-early

And they are using an existing engine, but they will have to do more than just some minor modifications.

And did you even read my post? I said that Kingdom Hearts 2 ported over almost all the graphical elements from Kingdom Hearts 1. The team did not have to spend any time developing those (which is what takes the longest), so all they had to do was use the existing elements and even worlds and just add to them a little. 

With this, you are developing for a completely different generation. All your graphical elements must be built from the ground-up.