John Wick director David Leitch has been officially brought on board to helm the sequel but since many directors need to start essentially from scratch in order to build a movie the way they want to, it will likely be some time before Deadpool 2 is ready to pull the trigger on production.
However, the recent departure of director Tim Miller likely set things back a bit.
It appears that Miller and star Ryan Reynolds had been dealing with creative differences on the first film, and things just became too much of an issue in the lead up to the sequel.