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A general description is here.
The default for ‘Sweave()’ is to produce only PDF figures (rather than both EPS and PDF).
There are improvements in the way ‘Sweave()’ and ‘Stangle()’ handle non-ASCII vignette sources, especially in a UTF-8 locale: see ‘Writing R Extensions’ which now has a subsection on this topic.
Inside ‘uniroot(f, ...)’, ‘-Inf’ function values are now replaced by a maximally *negative* value.
‘rowsum()’ could silently over/underflow on integer inputs (reported by Bill Dunlap).