Speculation by the people who do the data mining is we get Tchalla before years end. And I think we will be getting a character every month for a little while. Spiderman was leaked to be coming the March. And he has the least amount of data in the game of the characters i mentioned.
So Kate -October
Clint - November
Tchalla- December
Rhodes-January
Carol -Febuary
Spidey - March
These character has logos in leaked photos of early builds of these games. So these character were probaly mostly done when the game launched or atleats well on into development. With the amount of time and resources being spent trying to get this game bug free. I would expect some delays though at some point. I think I read somewhere they would release a rough road map at the next war table. Might have been B.s though