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A general description is here.
The functions ‘.C()’, ‘.Call()’, ‘.External()’ and ‘.Fortran()’ now check that they are called with an unnamed first argument: the formal arguments were changed from ‘name=’ to ‘.NAME=’ in R 2.13.0, but some packages were still using the old name. This is currently a warning, but will be an error in future.
‘spline()’ and ‘splinefun()’ gain a new method ‘"hyman"’, an implementation of Hyman's method of constructing monotonic interpolation splines. (Contributed by Simon Wood and Rob Hyndman.)
‘maintainer()’ now converts embedded new lines to spaces. It no longer gives a non-obvious error for non-installed packages.
‘arima.sim()’ could give too long an output in some corner cases (in part, PR#15068).
Long custom line types would sometimes segfault on the cairographics-based devices. (PR#15055.)