That was my original worry about the ending to Remake, and was the main reason I disliked it (I still largely dislike the ending, but not as much as at first). But that Ultimania interview does seem to be pretty clear they're still following the general story in the next game.

I think the whole defying fate thing will be a bit of a bluff (or triple bluff?). I just think they disliked the idea that everyone would know exactly how things play out in the future games, because there would just be no real tension or speculation from the fans. I think the ultimate reason for that is they want you to think that Aerith might not die this time, so that when it inevitably happens anyway (in a different time and place), it'll still be a bit shocking to us.