I think it will be more March than February that we hear something assuming a September filming start. By that I mean, Gunn may announce it's officially been given the greenlight.
I would be shocked if we hear casting that early though, I don't remember the timeline for the batman, but were they already in preproduction when Reeves started announcing cast members?
If he is talking with the cast members about story that is good news, because up to now, most have said they haven't heard anything. He's been finalizing the script since doing interviews in September for the penguin, that was five months ago now