Marvel Phase 4: 7 New MCU Rumours You Need To Know

2. Black Knight IS Coming

Source: Roger Wardell

And another one from Wardell here, which ties in with lots of rumours from before Endgame's release concerning the Black Knight. According to him, the fan favourite character is still planned as a forthcoming MCU addition:

It's an intriguing one, because for now we pretty much have no Avengers team. It is, of course, inevitable that we'll see them coming together again at some point (possibly not until Phase 5, though and most likely not until after the current crop of semi-announced Marvel projects are all out of the way), but this would suggest that The Black Knight won't debut for some time.

The idea of a sort of fish-out-of-water character joining the group does make sense, though, because there is precedent there with Thor's arc, but that was rushed and the potential was never fully realised.