New Batgirl behind-the-scenes images show Michael Keaton's Batman in the upgraded bulletproof batsuit from The Flash. Batgirl would have continued that storyline before it was canceled during its post-production stages.One of The Flash's endings was changed by James Gunn. The initial plan would have reportedly seen Ben Affleck's Batman stuck in a different part of the multiverse and reaching out to Barry Allen, similar to how Flash reached out to warn Bruce Wayne in Batman v Superman from a different timeline. The ending would have also teased Keaton's Batman and Calle's Supergirl teaming up with Barry one more time for a Crisis on Infinite Earths adapted story steered by the previous Warner Bros. regime. However, before getting to this point, the previous regime had plans to release Batgirl, which would have followed this new timeline and introduced Leslie Grace's Batgirl opposite Keaton's Batman.New Batgirl movie images mysteriously leaked online that show more of Keaton's Batman in what is the same clock tower from the third act of Batman (1989 and Batgirl and Batman face-to-face in what appears to be a gothic version of Gotham City with cathedral-like architecture. The Flash changed the timeline that Barry ends up in, such as actor J.K Simmons from the DCEU continuing as Jim Gordon. However, Batgirl is presumed to have taken place in the Burton-verse. Insider ViewerAnon says this universe looks like Tim Burton's Gotham, claiming they had seen the movie before it was scrapped and saying it was “solid.”
Despite DC Studios CEO Peter Safran calling Batgirl unreleasable and that it would have hurt the brand. However, speculation from Kevin Smith, ViewerAnon's comments, and behind-the-scenes images tell a different story. The Flash opened the multiverse for Batgirl and even the Snyderverse to co-exist as Elseworlds stories like Joker and The Batman with the DCU, so for WBD to spin a narrative around the quality of Batgirl to justify not releasing it, only for the studio to receive a tax write-off for doing so, may not instill confidence that the new leadership knows what is best for the brand or that their heart is in the right place.
Assuming Warner Bros. Discovery releases the alternate ending scenes of The Flash that more or less set up Batgirl, either in a director's cut or in the special features of the physical release, then releasing Batgirl would not conflict with the upcoming DCU, as long as it was marketed as being in its own DC Elseworlds timeline. However, it has been reported that the studio destroyed any hopes of Batgirl being released for tax write-off purposes.
Batgirl was canceled by Warner Bros. Discovery.
Source: ViewerAnon, Joe Russo