Human Head were once touted as being the studio behind Prey 2 and whilst that whole thing is up in the air, Kotaku has discovered that they were collaborating with Nintendo.
A former animator at Human Head revealed via documents that showed Nine Realms (a subsidiary of Human Head Studios) was developing a Teenage Mutant Ninja Turtles title for Android, as well as an unnamed Nintendo game.
Details are very scarce, but many assume that job listings at Human Head for an open-world mystery title, that appeared last year, could be related to the supposed Nintendo project. Of course, that is purely conjecture and not proven to be fact.