UPDATE 27/2/24: Yoko Taro has dropped another hint towards the future of Nier.
Taro posted a single word, written similarly to "REP3NT", on social media platform X earlier today: "r3incarnation".
There's already a game called Nier Reincarnation, albeit a free-to-play mobile one which is shutting down service this April. Could Reincarnation be making a return either as or via Nier 3?