Every single bit of "news" about the Flash movie doesn't seem founded in anything beyond the articles' writers' personal wishes or "Wouldn't it be cool if..." mentality. Is Affleck in it? Yeah, sounds like that's a deal. Apparently, Affleck's Batman will be like a face for Barry, as they share stuff. But this is about all we know. Beyond that, Iris is in it played by the same actress from Justice League, and Barry's dad is in it, but isn't played by the same actor. Every other shred of anything else is made up and probably fake.
I wonder about how they'll explain Keaton's universe. Is that universe created by Flash's time traveling, or was it always there and Flash is only accessing it somehow?