As we mentioned in Dynamics 365 Releases, Microsoft releases Dynamics 365 features in two waves during the year (April and October). The next release (April) is already approaching and preview features can be tested in a Sandbox from February on.
The Dynamics 365 release plan (formerly release notes) for the 2020 release wave 1 describes all new features releasing from April 2020 through September 2020. You can either browse the release plan online or download the document as a PDF file. The PDF file also includes information about Power Apps, Power Automate, Power Virtual Agents, Power Platform governance and administration, and Common Data Model and data integration.
For further details visit Dynamics 365: 2020 release wave 1 plan.