This blog is updated daily.
A general description is here.
Making refman.pdf works around a problem with the indexing with hyperref 6.79
qchisq(p, df, ncp, lower.tail = FALSE) with ncp >= 80 was inaccurate for small p (as the help page said): it is now less inaccurate. (In part, PR#13999.)
For ncp less than but close to 80, pchisq() and qchisq() are more accurate for probablilities very close to 1 (a series expansion was truncated slightly too early).
pchisq(x, df, ncp) no longer
can return values just larger than one for large values of ncp.
unsplit(drop = TRUE) applied to a data frame failed to pass 'drop' to the computation of row names.