Unknown - Star Trek 4, Star Trek Prequel, rumored fourth and film Star Trek films
Beyond that, there are three Star Trek films in the works, none of which have any real timeline to follow. The most obvious is Star Trek 4, which would feature Chris Pine, Zoe Saldana, Zachary Quinto, and the rest of the surviving cast members from Star Trek's Into Darkness and Beyond respectively. It's unknown if and when the film will come out as it's largely been in production for eight years now.
The other film is the prequel film to the Star Trek Kelvin Timeline. This is expected to be the origin story of Starfleet in the Kelvin Universe and will feature the early version of the Federation and possibly the NX-01 Enterprise. Like with Star Trek 4, it's expected to be a theatrical release. While it has more done, the prequel film still doesn't have a release window.
The last film is nothing but a rumor but there are two other ideas being kicked around. Firstly there's the Kalinda Vazques script which is said to be an original script. Then there's also rumored to be a Star Trek: Picard film being written with the idea of Patrick Stewart returning to the role one final time. Neither are in pre-production, more just ideas being kicked around.