At the Defenders panel as San Diego Comic Con, Marvel announced that a new season of Iron Fist has begun production. The news is so fresh, Finn Jones just found out about it onstage. From Bleeding Cool's live coverage of the panel:
First big announcement is that Iron Fist season 2 is beginning production. Loeb says: "A friend of Colleen's is coming by and I might get a bit Misty." Iron Fist star Finn Jones just learned that his series was renewed.