Robot Framework 4.0 is a new major release with lot of big new features such as the SKIP status and native IF/ELSE support as well as enhancements to, for example, type conversion and Libdoc. Robot Framework rc 2 contains all planned changes, and changes compared to the earlier rc 1 a minimal. The final version is planned to be released on Thursday Match 11, 2021.
For more information about Robot Framework 4.0 rc 2 see the [full release notes](https://github.com/robotframework/robotframework/blob/master/doc/releasenotes/rf-4.0rc2.rst).