This blog is updated daily.
A general description is here.
'Rcmd open' now work as documented: previously 'Rcmd open.exe' was required.
The remaining Perl scripts build, check, Rprof, Sd2Rd in R_HOME/bin now have extension .pl.
Rcmd (or R CMD) can now run .sh (shell) and .pl (Perl) scripts anywhere on the path (as well as .bat and .exe files as before).
Help in base and recommended packages is no longer zipped: text,
HTML, latex and examples files are now built when needed.
Options --use-zip and --use-zip-help in R CMD INSTALL are no longer available and --auto-zip only zips data (or not).
Help in packages installed under 2.9.x may not work correctly, and a warning is given when such a package is attached by library(). Re-installation of all packages is advised (use update.packages(checkBuilt = TRUE)).
Binary packages are installed without CHM help if they contain it (as those intended for 2.9.x may).
Help files are no longer zipped: rendering as text, HTML, latex or examples is now done when needed.
Options --use-zip and --use-zip-help in R CMD INSTALL are no longer available and --auto-zip only zips data (or not).
Help in packages installed under 2.9.x may not work correctly, and a warning is given when such a package is attached by library(). Re-installation of all packages is strongly recommended (use update.packages(checkBuilt = TRUE)).
Binary packages are installed without CHM help if they contain it (as those intended for 2.9.x may).