To be entirely fair,
Advent Children has had Cloud slipping in and out of a
thin place into
the "White Room" reality where Zack & Aerith are both able to talk to him and time doesn't flow equivalently in those locations. Even before that, there's
Aerith's hand reaching out to him from the light at the end of the original
FFVII from a glowing light as well, so while there's plenty of room for exploration of what they're doing with that conceptually I don't think it'll be too big of a stretch from what we've seen before in the series. Those were established even before
Ever Crisis having the Portal Materia do those things a bit more in the context of a "What If?" explicitly as an alternative possibility of something that might have been and leaves its mark on the individual's heart even if they can never carry any memories of being in that space – which is exactly how those moments impact Cloud as pseudo-overlapping versions of reality that don't exist coterminously,
EXACTLY like the end of Remake shows, where Aerith senses it because of her connection to the Planet as the last of the Cetra.
Even WAY back with
The Maiden Who Travels The Planet there was a fairly conscious awareness of other entities around within the flow of the Lifestream that shaped itself into a contextually malleable projection of reality, not to mention that just like Zack –
Biggs was explicitly left with unfinished business when he died in Remake. We've never really gotten a look at the idea of what a "Promised Land" might be like from the perspective of the deceased, nor what sort of place the Lifestream might become for those who are returning if the sensory system of the Planet was being distorted with Red XIII describing the Feelers (Whispers) undulating within Sephiroth at the end of
Remake.
All of that just plays HEAVILY into the ways where we see in
the first Rebirth trailer that Sephiroth is attempting to make Cloud doubt his memories about things like who Tifa really is and if she's the original person that he believes that he knew back then, especially as he becomes more and more aware of himself as an unreliable narrator, and how
his continuity of events is full of disconnected and misplaced information like we hear him talk about in this new trailer.
I think that
Rebirth is just doing that with an even more overt
"it's literally in the title of the game" mechanism to introduce that same overwhelming level of an inability to trust what you're seeing that Cloud continually experiences psychologically. It's building up the doubt in players about what's going on in EXACTLY the same way that Cloud is experiencing that, so that we get pulled along on the same emotional journey, but with a more layered focus than just the distortion of what actually happened in Nibelheim.
That all seems even more apparent especially after the official
FFVIIR Twitter posted this:
Not only are there Whispers & Black Feathers all around in the
Rebirth scene, but the title makes it more obvious that it's not really clear what Zack's "rebirth" in defiance of destiny even was at the end of
Remake. That's the detail that's going to be centered into the core mystery of everything in the game. Personally I find this especially interesting given that the cries of the dead yearning out in pain and formed into a gigantic swirl of spiritual energy driven by their collective subconscious has been what shapes the voice and Will of the Planet in
FFVII, but
it's also the same concept that's representative of the "Idea of Evil" in the decanonized chapters of BERSERK that came out just months before the original
FFVII released. In the quarter century since then, there've been a lot of nuance to how those things are depicted when it comes to the struggles against fate, loss, & free will – but especially in how the moral position of aligning or opposing that shifts with EXTREMELY tiny shifts in nuance.
That all being said.
Most importantly though, just look at how spectacular Dio looks
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