So basically KH0.2 (the Aqua game within the 2.8 HD collection) hints at a KH2.9? Um.....while that is baffling to be honest considering they SHOULD have KH3 ready for Fall 2017/Early 2018 at this point, it sorta makes sense.
While we all thought 0.2 would be the 'Demo' like how FFXV got two of them (one bundled with Type-0 and another one that went up on PSN/XBL), they do indeed plan on having a special demo for KH3 bundled with something.....maybe FFVII Remake Part 1 if that releases this year? The next Tomb Raider if Square has the next one ready for this fall?
If this is indeed the plan.....I'm not too upset. People have things within KH's to play using KH3's combat systems and mechanics, the story can continue (even if by bits and pieces) and the development team will not feel overly pressured (which is important, considering they originally were making 3DS and PSP games before being assigned to KH3).
I honestly think FFVII Remake will follow the .Hack model someone mentioned in this thread before. The first part has a long development cycle while the other three parts release not long after (every 6-8 months) so development is both rapid and fast.