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A general description is here.
axis() now respects the setting of par("xpd") when clipping.
The axis() function now distinguishes between setting "at" to NULL or a zero-length vector, treating the latter as a request for no ticks. This corrects the handling of the "x" parameter to rug().
glob2rx("*[*") now produces a correct regular expression.
The canvas is no longer painted on copy or save in Cocoa Quartz.
identify() in Quartz can now be terminated by either using popup menu equivalent (Ctrl-click or second mouse button) or by pressing the <Esc> key. The latter was documented but did not work.