As of right now, Marvel Studios' plans beyond Avengers 4 are a total mystery and we currently have no idea what form Phase 4 will take beyond it including movies like Guardians of the Galaxy Vol. 3 and the Spider-Man: Homecoming sequel. However, as you can see from the Tweet below, Kevin Feige has shed at least a little more light on what's to come and there's a whole lot here for us to think about it.
For exactly, "different incarnations of characters you know" has to be a reference to someone else potentially suiting up as Captain America once Chris Evans decides to walk away from the role.
At this point, it's hard to imagine that the studios has many "completely new characters" left to introduce but the Kamala Khan version of Ms. Marvel is obviously among them. Feige has previously indicated that plans are being put in place for the hero but made it clear that we won't see her until Brie Larson's Captain Marvel makes her debut (which makes sense if you've followed the comics).
"We wanted to get Captain Marvel out there first so that there is something for a young Muslim girl to get inspired by," he notes. What are you most excited to see from the MCU moving forward?