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A general description is here.
The ‘"source"’ attribute (which has not been added to functions by R since before R version 2.14.0) is no longer treated as special.
‘R CMD check --as-cran’ now checks code usage directly on the package namespace without loading and attaching the package and its suggests and enhances.
The HTML generated by ‘tools::Rd2HTML()’ and ‘tools::toHTML()’ methods is now XHTML 1.0 Strict.
There is support for testing the ‘\dontrun’ and ‘\donttest’ parts of examples in packages.
‘tools::testInstalledPackage()’ accepts new arguments ‘commentDontrun = FALSE’ and ‘commentDonttest = FALSE’.
‘R CMD check’ gains ‘--run-dontrun’ and ‘--run-donttest’ options.
‘R CMD check’ now reports empty imports in ‘NAMESPACE’ as these are common errors (writing ‘importFrom(Pkg)’ where ‘import(Pkg)’ was intended).
‘edit()’ (and hence ‘fix()’) failed if an object had a non-character attribute named ‘"source"’ (an attribute that had been used in R prior to version 2.14.0).