In a new interview with LA's KCRW, director Matt Reeves makes it official: The Batman will not be a part of the larger DC extended universe. A one-off adventure, in other words, one untethered from the events taking place in the rest of the DCEU.
Says Reeves (as quoted by The Wrap):
“Well, I have a vision for a way to do something with that character that feels like it resonates with me personally, and a perspective that can grow out into other things. When (Warner Bros.) approached me, what they said was ‘look, it’s a standalone, it’s not part of the extended universe.'”
This opens up the door for all kinds of possibilities, so many that we're not even sure that it makes any sense to speculate (we'll encourage you to, anyway, of course). Reeves is starting The Batman over from scratch - jettisoning the script previously written by Ben Affleck and Geoff Johns - so this could mean literally anything. Given that Reeves is at the helm (and given how strong his directorial track record is), we're prepared to consider this an overall good thing, but we won't know much more until The Batman starts taking shape.
For now, we can only recklessly speculate. Do that below or over at this post, which we ran before the quote above crossed our desks.