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A general description is here.
Function ‘compactPDF()’ in package ‘tools’ now takes the default for argument ‘gs_quality’ from enironment variable ‘GS_QUALITY’: there is a new value ‘"none"’, the ultimate default, which prevents GhostScript being used in preference to ‘qpdf’ even if environment variable ‘R_GSCMD’ is set.
‘bxp()’, the work horse of ‘boxplot()’, now uses a more sensible default ‘xlim’ in the case where ‘at’ is specified differently from ‘1:n’, see the discussion on R-devel, <URL: https://stat.ethz.ch/pipermail/r-devel/2011-November/062586.html>.
Function ‘setClass()’ in package ‘methods’ now returns, invisibly, a generator function for the new class, slightly preferred to calling ‘new()’, as explained on the ‘setClass’ help page.
The supported toolchain has changed since the one used for R 2.12.0 to 2.14.x: see the‘R Installation and Administration manual’. Compiled code (except DLLs) may be incompatible with previous toolchains (and compiled C++ code almost certainly will be).
This is a ‘multilib’ toolchain: there is a single set of tools in the ‘bin’ directory and which sub-architecture is selected by a flag: in most cases ‘-m32’ _vs_ ‘-m64’.