Take a step back, then one to the right, then take a step forward.
WonderBat in DCEU is about at an 99% chance of happening imo. Gotham City Cirens doesn't change anything because I doubt tht film will have much revelance to the DCEU, especially if they cast a young CW. And CW is not going to be in Batfleck movie so yes to tht. And from everything we've seen, BM and WW have been constantly standing next to each other in JL.
Now in comics and animations, mmmmm that's about a 0.01% chance of happening at this point.
Believe me I hate being perpetually pessimistic, but the way I see it, there's really not much evidence to inspire any kind of optimism in seeing BMWW happening in the DCEU. First of all, this is DC/WB we're talking about, and if there's anything they know how to do, it's to play it safe and stick to what's most predictable. So seeing something like BMWW, even though it's popular and has a vocal fanbase, done in their first ever Cinematic Universe would've been a very bold move, and very uncharacteristic of DC/WB. Whenever DC tries and shake up the formula (like with SMWW), they generally go all in and try their damnedest to forcibly make it work, and they usually cut off any escape routs while they're at it, just to show how much they're willing to stick to their guns.
I mean it took DC 5 years to admit that SMWW was a gigantic mistake, and even now long after it's been over, we still see SMWW popping out at different places due to DC's strategy of marketing the concept that stretched several years in advance. So if they're gonna jump to BMWW all of a sudden, I expect them to make a huge deal about it, as that would definitely mean BMWW will become the next big thing in all DC media. However, so far beside placing Diana and Bruce next to each other in JL photos, which could be attributed to the fact that they'r the big stars of the movie with Superman's absence, there's nothing else to conclusively suggest that BMWW is even anywhere in their minds. We can tell that the relationship between Diana and Bruce will play a big part in the upcoming Justice League movie, but that's about it. With Superman's revival, we don't really know how the relationship between the Trinity will play out in future movies.
Don't forget that similar to Justice League Action, the plans for the DCEU were most definitely made during the time SMWW was in full swing, so if we ended up getting BMWW in the DCEU it would be nothing short of a miracle. I believe that Zack Snyder is probably the one who wanted to include BMWW in the DCEU back when he had absolute control over the movies. Now however, after Zack's role seemed to have diminished, and with DC exerting more control over the DCEU and WB going into panic mode, things might've changed a great deal. The new Gotham City Sirens movie and the introduction of Catwoman could be among these changes. I can tell that BMWW was definitely something they've considered or wanted to do at some point, but the question remains if WB is still willing to go through with it after all the changes and shake ups that happened to the DCEU, especially considering they've yet to commit to anything.
That's just how I see things as they are now. I would love to be proven wrong, but until I get to watch Justice League next year, I won't hold my breath for anything. I think that if they're seriously considering BMWW, we should gets something in the Justice League movie, and even then I'm not expecting much.