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A general description is here.
There is a new package ‘parallel’.
It incorporates (slightly revised) copies of packages ‘multicore’ and ‘snow’ (excluding MPI, PVM and NWS clusters). Code written to use those packages should work unchanged (apart from changing any references to their namespaces to a reference to ‘parallel’).
It also contains support for multiple RNG streams following L'Ecuyer _et al_ (2002), with support for both ‘mclapply’ and ‘snow’ clusters.
(It is still incomplete/experimental.)
The default ‘colormodel’ for ‘postscript()’ and ‘pdf()’ is now called ‘"srgb"’ to more accurately describe it.
The ‘postscript()’ and ‘pdf()’ devices only include the definition of the sRGB colorspace in the output file for the colormodels which use it (and not for ‘"gray"’ nor ‘"cmyk"’).
‘postscript()’ with values ‘colormodel = "rgb"’ and ‘colormodel = "rgb-nogray"’ give the behaviour prior to R 2.13.0 of uncalibrated RGB, which under some circumstances can be rendered much faster by a viewer.
‘pdf(colormodel = "rgb")’ gives the behaviour prior to R 2.13.0 of uncalibrated RGB, which under some circumstances can be rendered much faster by a viewer, and the files will be smaller (by about 9KB if compression is not used).