I've read the spoilers as I'm not too bothered, TBH. I can still play it knowing the twist as I don't know anything else and I was expecting something similar.
All it confirmed for me is that's what happens when you touch a game that didn't need a sequel. That's what I've been saying before, much to the dismay of some people here because it's ND and all.
When you have a game with such a powerful but subtle ending and with everything that happens leading to that ending, you let it go to rest.
Otherwise, you're bound to go overboard trying to top the plot of the first game and shock the fans, which is probably what'll happen here. Even if it's beautifully done, I'm pretty sure it won't go down well.