I know this is a month old, but I did a search to see if this project was happening or not and found this:
It claims that Vaughn is searching for a new writer/director and the actors, or at least Moretz, are physically prepping for the film. So, if the actors are preparing, it sounds like the movie may actually happen.
However, without Vaughn and Goldman deftly reimagining the story like they did with the first one, I fear this will fall flat on its face. Time will tell.