I'm sure most people will have seen this elsewhere already, but just in case the three projects have been revealed as...
Kamen Rider W: Fuuto PI.
A manga by this name (written by Double's head writer, Riku Sanjo) has been going for a while as the "official sequel" to Double. That manga is now going to be adapted into an anime by Toei Animation. It's expected to begin broadcasting in summer 2022, and seems to have already been licensed by Funimation.
Kamen Rider Black Sun.
A reboot of Kamen Rider Black aimed at an adult audience. It will be directed by Kazuya Shiraishi, an up-and-coming director who received a lot of critical acclaim in Japan for his 2018 crime drama "Blood of the Wolves." It is due to begin airing in spring 2022.
Shin Kamen Rider.
Evangelion creator Hideaki Anno has already directed Shin Godzilla, he's in the process of making Shin Ultraman (currently delayed due to covid), and Toei have signed him up to create Shin Kamen Rider. Apparently this has already been in the works for six years, and was originally meant to come out this year as the centerpiece of their 50th anniversary celebrations. But they now say that covid has completely messed up their timetable, and it's now tentatively scheduled for March 2023!
And before anyone asks the obvious question concerning names, the Japanese spelling of Shin uses different characters to the 90s Shin Kamen Rider. They are the same characters used for the Shin in the Godzilla and Ultraman movies though.