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A general description is here.
The cascaded stylesheet ‘R.css’ now adds less vertical white space when rendering Rd files' \itemize, \enumerate, and \describe list \items to HTML.
Where R is used via extensive IDEs such as ‘RStudio’, their maintainers may need to adapt ‘R.css’ files accordingly.
‘R CMD check’ when passed a tarballl looks at its contents and so no longer derives the package name from the tarball name (which can now be arbitrary).
‘R CMD check’ now handles archives with extension ‘.tar’ or ‘.tar.zstd’ (where ‘zstd’ compression is supported by the R build).