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A general description is here.
The out-of-the box Bioconductor mirror has been changed to one using 'https://': use 'chooseBioCmirror()' to choose a 'http://' mirror if required.
(Windows only) 'download.file()' with default 'method = "auto"' and a 'ftps://' URL chooses '"libcurl"' if that is available.
(Non-Windows only) 'download.file()' with default 'method = "auto"' now chooses '"libcurl"' if that is available and a 'https://' or 'ftps://' URL is used.
Graphics devices can add attributes to their description in '.Device' and '.Devices'. Several of those included with R use a '"filepath"' attribute.