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A general description is here.
format.POSIXlt() could cause a stack overflow and crash when used on very long vectors. (PR#14267)
pchisq(ncp =, log.p = TRUE) is more accurate for probabilities near one. E.g. pchisq(80, 4, ncp=1, log.p=TRUE). (Maybe what was meant in PR#1412216.)
The Rgui console, pagers and editor on the 64-bit build now have a title bar icon.
The outer frame/console for RGui/Rterm mention '(64-bit)' to make it easier to distinguish running copies of R.