I really, really hope not. Gunn produces so-so formulaic suphero stuff. GotG was his high-point. Reeve's
The Batman was beautifully shot and genuinely felt different to both DCU and MCU movies. I also really want to see more of his Joker.
https://youtube.com/watch?v=RUbWMVE4JuE
Reeves also clearly genuinely is into the Batman mythos because the 'easter eggs' such as they were, were not just some slapped on background details by committee but woven into the script. The little bits about "Hush" for example. I also really like that Reeves portrays Batman with a degree of realism. I'm not talking about turning giant hulking Bane into a normal scale man or things like that, I'm talking about how his Batman plans his activities out in meticulous detail, knowing that the reality is he can't actually be everywhere or just jump in without planning, but actually studies the criminals, the crimes and focuses on how he can cause the most fear and superstition. His Batman is two years since his debut and still learning and very aware of the risks.
What particularly shows is that Reeves is both the co-writer and director of the film. That really helps bring out a vision. If Gunn has done this I will be pissed off.