The Japanese release for NieR Reincarnation has announced the next collaboration, namely with Drakengard 3, otherwise also known as “Drag-On Dragoon 3” in Japan. You can check out the announcement trailer via the official Twitter here.
NieR Reincarnation will be having the Drakengard 3 collaboration on 8 May 2021. The trailer only reveals Zero joining the game as a playable character, presumably going up against the rest of her sisters as she does in her game. However, the tweet does reveal that Mikhail will also be part of the collab, appearing in his dragon form.
For those awaiting the English release, the official EN social media channel did release a status update that you can read about here.
In any case, the Japanese release being ahead of the English one will give you the gift of foresight, so you can start saving up for these collab units.