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A general description is here.
The Bioconductor ‘version’ used by ‘setRepositories()’ now defaults to ‘3.0’. (It can be set at runtime _via_ environment variable ‘R_BIOC_VERSION’.)
‘embedFonts()’ now defaults to ‘format = "ps2write"’ for ‘.ps’ and ‘.eps’ files. This is available in Ghostscript 9.x (since 2010) whereas the previous default, ‘format = "pswrite"’, was removed in Ghostscript 9.10.
‘unique(warnings())’ and ‘c(warnings())’ are now supported.
The ‘configure’ script reports on the more important capabilities/options which will not be compiled in.
When building R as a shared library, the ‘-L${R_HOME}/lib${R_ARCH}’ flag is placed earlier in the link commands used during installation and when packages are installed: this helps ensure that the current build has priority if an R shared library has already been installed by e.g. ‘install-libR’ in a library mentioned in ‘LDFLAGS’ (and not in ‘your system's library directory’ as documented). (Wish of PR#15790.)