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A general description is here.
The ‘colormodel’ for ‘postscript()’ which does use both gray and sRGB colorspaces is now called ‘"srgb+gray"’.
Plots which are known to use only black/white/transparent can advantageously use ‘colormodel = "gray"’ (just as before, but there is now slightly more advantage in doing so).
In the same spirit, ‘median(x)’ now gives an error for a data frame ‘x’ (it often gave nonsensical results).
A late change in R 2.13.2 broke ‘\Sexpr’ expressions in Rd files.
The creation of ticks on log axes (including ‘axTicks()’ sometimes incorrectly omitted a tick at one end
The creation of ticks on log axes (including by ‘axTicks()’) sometimes incorrectly omitted a tick at one end of the range by rounding error in a platform-dependent way. This could be seen in the examples for ‘axTicks()’, where with axis limits ‘c(0.2, 88)’ the tick for ‘0.2’ was sometimes omitted.
‘unstack()’ sometimes produced incorrect results (a list or a vector) if the factor on which to un-split had only one level.