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A general description is here.
cChanges to S4 and S3 method dispatch will support S4 class inheritance for S3 methods, primitive and via UseMethod() and do better on S3 inheritance per-instance for S4 methods. See ?Methods and the paper referenced there.
CP1257 encoding for postscript/PDF has been corrected. (PR#13736)
aov() with an error term was evaluating the ... arguments in 2.9.0 whilst checking their names, so could fail by evaluating them in the wrong place. (PR#13733)
The print() method for arima() failed if all coefs were fixed.
Prevent rectangles of size < 0.5 pixel from disappearing in Quartz when using rastered backend. (PR#13744)
pPrinting _NA_complex_ had a low-level thinko; patch thankeds to Bill Dunlap.