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A general description is here.
R CMD check has a new option '--timings' for record per-example timings in file <pkg>.Rcheck/<pkg>-Ex.timings.
New print() (S3) method for class "function", also used for auto-printing. Further, .Primitive functions now print and auto-print identically. The new method is based on code suggestions by Romain Franççois.
Trying to assign into a raw vector with an index vector containing NAs could cause a segfault. Reported by Hervéé Pagèès.
gregexpr() no longer segfaults when "" is given as the search pattern. Thanks to Hervéé Pagèès for the bug report.
CHAR() now returns (const char *) since CHARSXPs should no longer be modified in place. This change allows compilers to warn or error about improper modification. Thanks to Hervéé Pagèès for the suggestion.