That Joker movie will be an origin tale directed by Todd Phillips, and reportedly starring Joaquin Phoenix.
Yes, Warner Bros. is trying to make two separate movies about the Joker, one of which is unconnected to the Jared Leto version and the DCEU.
The studio seems set to move forward with the project, and current rumors suggest it will begin filming this September in New York City.
DC and Warner Bros. have a lot of fats in the fryer right now, but maybe the projects that are getting the most attention at the moment are the two that involve the Joker.