Read Bethesda's tweet:
We can confirm that Shinji Mikami has decided to leave Tango Gameworks in the coming months. We thank him for his work as a creative leader and supportive mentor to young developers on The Evil Within franchise, Ghostwire: Tokyo, and, of course, Hi-Fi RUSH.
We wish Mikami-san well in the future and are excited by what lies ahead for the talented developers at Tango.
—Bethesda