The next gen models appear to be based on the cgi versions of the characters in a way, not looking exactly the same, but their faces, bodies and clothing take after their cgi counterparts:

 

 

 

Aqua cgi model vs trailer Aqua:

 

 

Riku and Kairi in the 2015 2.8 trailer versus the new one, major improvements to the shading, hair and more! 

 

Clothing and facial similarities to their cgi versions:

 

 

Kairi's dress being a lighter shade and less tight looking, more ''Baggy''(can be seen where the belt sits), shiner zippers, her hair and face shape taking after her cgi version. Riku is missing the blue line on the vest in his KH2 model, but his cgi version also doesn't have that blue line, overall he looks very similar to his cgi counterpart.

 

I'm hyped for seeing Sora and Kairi fully they are cute as hell 

Edited September 15, 20169 yr by Yuno Gasai

Didn't realize the improvements of Riku's and Kairi's models are that good, damn.

 

And yeah they look a bit simliar to their CGI counterparts, I love that

A shift from standard definition to high definition, and from PS2 to PS4 really demonstrates the technological advancements that Square Enix are able to make with this title. If anything, the delay means that they're able to fix bugs more comfortably and make the visual assets look that much sharper.