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A general description is here.
There are two new options for typesetting PDF manuals from Rd files. These are ‘beramono’ and ‘inconsolata’, and used the named font for monospaced output. They are intended to be used in combination with ‘times’, and ‘times,inconsolata,hyper’ is now the default for the reference manual and package manuals. If you do not have that font installed, you can set ‘R_RD4PF’ to one of the other options: see the ‘R Installation and Administration Manual’.
‘R CMD check’ now checks line-endings of makefiles and C/C++/Fortran
sources in subdirectories of ‘src’ as well as in ‘src’ itself.