This blog is updated daily..
A general description is here.
.find.packages(), packageDescription() and sessionInfo() assumed that attached environments named "package:foo" were package environments, although misguided users could use such a name in attach().
spline() and splinefun() with method = "periodic" could return incorrect results when length(x) was 2 or 3.
Trailing spaces are now consistently stripped from \alias{} entries in .Rd files, and this is now documented. (PR#9915)