Despite unexpected hiccups which resulted in the more than one month+ delay, it was announced earlier today by the PowerShell Team blog on Wed 4 Mar 2020 that the latest open-source, cross-platform* PowerShell 7.0.0 (based on .NET Core 3.1) has finally gone RTM and is now generally available for download on GitHub.
Read all about it from the official source or from independent sources (here and in German here), including important end-of-life (EOL) information concerning the previous version of .NET Core 3.0 over here.
See also What’s New in PowerShell 7.0.
* Windows, Linux, macOS (x64 and ARM platforms)