This blog is updated daily.
A general description is here.
iconv() has a new argument 'mark' which can be used (by experts) to suppress the declaration of encodings.
grep() and friends now use useBytes=TRUE to inhibit the translation of inputs with marked encodings.
There have been various bug fixes and code reorganization in the Rd renderers Rd2HTML, Rd2latex, Rd2txt, and Rd2ex.
All example files are now created with ASCII or UTF-8 encoding, and the encoding is only marked in the file if there is any non-UTF-8 code (previously it was marked if the help file had non-ASCII contents, possibly in other sections).
approxfun() and approx() now accept a 'rule' of length two, for easy specification of different interpolation rules on left and right. They also
They no longer segfault for invalid zero-length specification of 'yleft, 'yright', or 'f'.
gsub() in a non-UTF-8 locale with a marked UTF-8 input could in rare circumstances overrun a buffer and so segfault.