This blog is updated daily.
A general description is here.
‘R CMD check’ now warns (rather than notes) on undeclared use of other packages in examples and tests: increasingly people are using the metadata in the ‘DESCRIPTION’ file to compute information about packages, for example reverse dependencies.
str(*, ....., strict.width="cut") now also obeys 'list.len = n' (Reported by Sören Vogel.)