I had an idea for the opening to Kingdom Hearts 3, although we've had little compilations at the beginning of Kingdom Hearts games, what if KH3 started out narrated by Ventus talking about a war, and I say Ventus because that was the voice that was in my head at the time, and he says there were the unversed, heartless, nobodies, and dream-eaters...I didn't get to far with it but do you think it should start out similar to this?

Hmm... I like the idea a lot, as since a lot of casual fans will be playing the game again... Well, they're going to need to be brought up to speed. I don't know how I feel about it being Ventus, though. I don't know how he'd know all of this stuff, but I guess it doesn't matter that much.

 

Personally, I always imagined the game's opening to be an "amv" type thing (like BbS, KH1, KHII, and 3D's all were), but with Kairi's training. Basically, I imagine it showing off Kairi's training as well as recapping the series. For instance, there could be a flashback to when Roxas fought Axel in KHII, and used the Reaction Command where he pushed off the wall err... fire with his feet, and then it could flash to Kairi trying a similar move against someone in Yen Sid's tower or something. IDK. I just really want to actually see Kairi's training (as well as more flashbacks from the whole series), and I think it'd be cool if we could get it all in CG. Especially the epic fight scenes. LOL.

Ventus: War has changed...

 

But, yes I actually kinda agree with you. But: As well as Ventus we should also have Vanitas (I just want him back as much as Roxas) and Riku narrating with him. And many more things with Intensity Level: OMFG THIS IS AWESOME NANOMACHINES!! Such as, flashback fights in CGI and an awesome theme song AND...Roxas.  

I am pretty sure it will start with the "Dark Side" (Xehanort's plans etc.). I mean at DDD's ending we only saw the "plans" of the "good side" .