Square-Enix always wants to make a Parasite Eve 4 as long as it makes money. That's the only thing they care about, how much a game sells. They don't care about respecting the source material, its concepts, its characters, any of that. If they think it'll sell copies, they'll use the name and faces in the most shameless and despicable ways possible until it stops selling.
It'll star "Aya Brea," but like with 3rd Birthday, not the real Aya, just the name and face since it'll help sell copies.
"Without me along, who will heal you when you're hurt?" - Rosa Farrell, Final Fantasy IV
Yeah, if you don't want any spoilers, I'd suggest avoiding these boards until you've played the game to form your own opinion. There's a lot of people here who just don't care and will spoil you anyway.