The Dynamics 365 and industry clouds release plan for the 2021 release wave 2 describes new features releasing from October 2021 through March 2022.
Dynamics 365: Key dates for the 2019 release wave 2
The release plan (formerly release notes) for the 2019 release wave 2 describes all new features releasing from October 2019 through March 2020 for Dynamics 365.
Release plans available June 10, 2019 | Early access available August 2, 2019 | General availability October 1, 2019