It seems to have taken forever to get here,, but The Batman: Part II will actually be moving into production to shoot April 2026.
At the Emmys, and with The Penguin taking home a gong for Best Actress, director Matt Reeves has been being asked about the sequel a lot.

Now that the script is finally finished, and a read through has happened, Reeves gave more detail to The Hollywood Reporter:
“We’re beginning. We’re staffing up. We’re starting to get our crew back together. We’re getting ready. We’re basically entering [pre-production]. We’ll be making the movie in the spring… super excited.
He’s also keen to maintain the secrets of the project:
Because of what the first movie was and what [The Batman: Part 2] is, which is so much a detective story, the idea of trying to protect the secrets of the movie is super important because it’s a mystery.
That would be an extra level of heartbreak if that part of it started getting out. You wanna keep the surprise so the fans… can have the fun experience that I always love going to the movies, which was to go and be surprised.”
Reeves also spoke about Pattinson’s read through of the script, and said he loved it.
Emmy winner Cristin Milioti is apparently not in the film, which feels like a big miss.
The Batman: Part II is expected in October 2027.