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A general description is here.
grid-based plots no longer reset the base text size to the default 96dpi in cairo-based bitmap devices.
Rd conversion was incorrectly parsing \\\* and \\\{ (and other cases with an odd number of backslashes greater than one).
Text conversion of \code{\ etc} was incorrect (a single backslash stands for itself inside \code).
\code{} inside \examples{} is now fixed up (but the warning remains, since it will be handled incorrectly in earlier versions of R).
as.matrix.data.frame() could fail if coercion changed the dimension of one of the columns (as e.g. the coercion of a "Surv" object to a character vector does).
When extracting part of a complex list structure using [[]] with a vector index, the extracted part was not marked for duplication on change. (PR#13411)