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A general description is here.
tools::texi2dvi() has a new argument 'texinputs' to allow the TeX and bibtex input paths to be specified (even on MiKTeX).
dev.copy2pdf() gains an 'out.type' argument to allow it to be used with cairo_pdf() or quartz(type = "pdf").
The use of unserialize() on character strings is deprecated: that was a format used in R < 2.4.0.
The C macro 'allocString' is deprecated -- use 'mkChar', or 'allocVector' directly if really necessary.
R CMD build tries harder to clean up the inst/doc directory from the remnants of earlier builds.
Encoding<- on NA_character_ converted it to "NA".
Adobe Symbol was missing from the encodings in tools::charset_to_Encoding.
diag(matrix(x, 0, 0)) now returns a 0-length vector of the correct mode, instead of always numeric.
Under certain rare circumstances the parser could accept invalid UTF-8 quoted strings.
Cocoa Quartz window could close without warning under certain circumstances (specific autorelease pool flush).