I don't think it's ever coming. Miro hasn't produced any major animation in ages and comebacks are almost never as strong as the original energy of the artist.
Yeah, his sudden life long desire to make games (never mentioned making games once while I've followed him from 2013 until a few years ago) and his focus on AI slop means that long animations are probably off the table. Even before the AI stuff when he just said he wanted to do games he said that he'll probably animate sex scenes only.
But who knows? When Miro was trying to go all out on making his stuff "mainstream" with the boy/girl first Bloodlust and it failed with his public, he immediately backpaddled and did a futa Bloodlust.
Now it's more of a tech issue imo. If he's "successful" with this AI game (whatever the fuck he defines "successful" as) he'll probably keep making these shitty AI content games.
If the AI sex animations part fails I think he'll revert to just doing 3d rendered sex animations in a shitty game.
If the game format is generally rejected I can see him going back to do long anims, but I wouldn't bet on it. The last 7 years have shown that he has no issue releasing small, sometime crappy things, while wasting time behaving like a tech bro that just found out about crypto shit.