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A general description is here.
The defaults for some of the options in ‘R CMD check’ (described in the ‘R Internals’ manual) have changed: the checks for unsafe and ‘.Internal()’ calls and for partial matching of arguments in R function calls are now done by default.
‘R CMD check’ now reports by default on licenses not according to the description in ‘Writing R Extensions’.
Printing of arrays did not have enough protection (C level), e.g., in the context of ‘capture.output()’. (Reported by Hervé Pagès and Martin Morgan.)
str(*, ....., strict.width="cut") now also obeys ‘list.len = n’. (Reported by Sören Vogel.)