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A general description is here.
‘capabilities()’ gets new entry ‘"Rprof"’ which is ‘TRUE’ when R has been configured with the equivalent of ‘--enable-R-profiling’, as it is by default; related to Michael Orlitzky's report PR#17836.
The ‘grid’ package now allows ‘gpar(fill)’ to be a ‘linearGradient()’, a ‘radialGradient()’, or a ‘pattern()’. The ‘viewport(clip)’ can now also be a grob, which defines a clipping path, and there is a new ‘viewport(mask)’ that can also be a grob, which defines a mask.
These new features are only supported (so far) on Cairo graphics devices and the ‘pdf()’ device.
The graphics engine version, ‘R_GE_version’, has been bumped to 13 and so packages that provide graphics devices should be reinstalled.