Matt Reeves recently revealed that he's meeting with James Gunn about all things The Batman 2 and how it fits with the new DCEU.
“They [Gunn and Safran] have been great. [...] We're actually supposed to meet in the next few weeks because they want to talk to me about the broad plan, and then they want to hear the BatVerse plan. We're just getting together to talk about all of that. Look, I'm excited to hear what they're going to do. The BatVerse thing, as James has said, and as Peter has said, is kind of its own thing they're letting us do.”
Source: Collider