As of right now, just consider May 21, 2021 "Keanu Reeves Day" at your local movie theater.
Per The Hollywood Reporter, the currently untitled fourth Matrix film has received a release date of May 21, 2021, which happens to be the same release date of John Wick: Chapter 4. So far, it's not known if this was a coordinated effort on behalf of Warner Bros. or Lionsgate, the respective studios developing these films, but considering Reeves' semi-recent popularity as "The Internet's Boyfriend," it's certainly not out of the realm of possibility.
The fourth Matrix film was confirmed back in August by Variety. Lana Wachowski has been tapped to write and direct the film. Both Reeves and Carrie-Anne Moss are confirmed to be in the film as Neo and Trinity.
In a statement, Warner Bros. Picture Group chairman Toby Emmerich said, "We could not be more excited to be re-entering ‘The Matrix’ with Lana. Lana is a true visionary—a singular and original creative filmmaker—and we are thrilled that she is writing, directing and producing this new chapter in ‘The Matrix’ universe."