We also have another introduction spotted in the poster: H.E.R.B.I.E., who was first introduced in the animated series The New Fantastic Four in 1978. He later debuted in the comics as well ...
Curiously, the key art features H.E.R.B.I.E., a robot character first introduced in the 1978 animated series The New Fantastic Four as a replacement for the Human Torch, whose rights were tied up ...
One more bit of trivia before we move on: Herbie was voiced in the animated series by Frank Welker ... Season 1 (which is presumably when the Fantastic Four will arrive) hasn't been announced ...