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A general description is here.
Experimental new functionality for S3 method checking, notably ‘isS3method()’.
Also, the names of the R ‘language elements’ are exported as character vector ‘tools::langElts’.
On Unix-like platforms with the ‘getline’ C library function, ‘system(*,intern = TRUE)’ no longer truncates (output) lines longer than 8192 characters, thanks to Karl Millar's PR#16544.
R now uses a new version of the logo (donated to the R Foundation by RStudio). It is defined in ‘.svg’ format, so will resize without unnecessary degradation when displayed on HTML pages.