Once more official information starts coming out about the film, it should include the new superhero as well, as it would be quite difficult for the producers to hide a detail like that in all their marketing.
Emotions among fans are quite high at the moment, and we expect that they will keep building up in anticipation of the official release, even though that’s definitely not going to be anytime soon. After filming is complete, this should give the producers something more to talk about, as well as other people attached to the film.
It could also be the perfect time for rumors, as we there will probably be lots of them during that period. With that in mind, fans who are following the developments around the film should probably arm themselves with some patience once the crew is done filming.
But that’s just a standard part of anticipating a major film release, and film fans must have gotten used to the idea at this point. Those who are wise enough to avoid falling for more outrageous rumors can usually avoid being disappointed once the film turns out to be nothing like those rumors are saying, especially if they were hyping up the audience for something spectacular.