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A general description is here.
Make macro ‘F77_VISIBILITY’ has been removed and replaced by ‘F_VISIBILITY’.
Make macros ‘F77’, ‘FCPIFCPLAGS’ and ‘SHLIB_OPENMP_FCFLAGS’ have been removed and replaced by ‘FC’, ‘FPICFLAGS’ and ‘SHLIB_OPENMP_FFLAGS’ respectively. (Most ‘make’ programs will set ‘F77’ to the value of ‘FC’, which is set for package compilation. But portable code should not rely on this.)
‘R CMD config’ no longer knows about the unused settings ‘F77’ and ‘FCPIFCPLAGS’.
New ‘str2lang()’ and ‘str2expression()’ as streamlined versions of ‘parse(text=., keep.source=FALSE)’ allow to abstract typical call constructions, e.g., in ‘formula’ manipulations. (Somewhat experimental)
The S4 generic signature of ‘rowSums()’, ‘rowMeans()’, ‘colSums()’ and ‘colMeans()’ is restricted to ‘"x"’.