Possible, but at this point I think they're gonna take the Endgame approach and spam Tobey/Andrew in commercials and media after opening weekend when the cat's out of the bag.
That allows them to take advantage of the organic hype in the lead up to release and milk it in the weeks after to really pad their numbers.
Well the reason I doubt they'll wait until opening day is the world premiere/red carpet will be before that. So it'll 100% be confirmed before any "regular" people see it.
They followed this exact same strategy with Spider-Man and "Civil War". Edited him out of the trailers then he appeared in the final one.
Fred.