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A general description is here.
New function ‘toTitleCase()’ in package ‘tools’, tailored to package titles.
Add lengths() function for getting the length of every element in a list.
‘R CMD check’ now checks that the ‘Title’ and ‘Description’ fields are correctly terminated.
‘R CMD check --as-cran’ reports if the ‘Title’ field does not appear to be in title case (see ‘Writing R Extensions’: there may be false positives, especially from technical words).
‘R CMD check --as-cran’ reports non-ASCII characters in R source files when there is no declared package encoding.
‘R CMD check --as-cran’ reports (apparent) S3 methods exported but not registered.
It reports overwriting registered S3 methods from base/recommended packages. (Such methods are replaced in the affected package for the rest of the session, even if the replacing namespace is unloaded.)
These checks can also be selected by environment variables: see the ‘R Internals’ manual.