For those who don't follow the R-devel mailing list, this was posted and contains valuable information for package maintainers:
Prof Brian Ripley wrote:
The major changes for R 2.0.0 are now in place, and we have provided a
set
of notes for package maintainers at
http://developer.r-project.org/200update.txt
on both changes needed and new opportunities.
The main thing which needs to be done is to revise the DESCRIPTION file,
in particular to ensure the Depends: field is accurate.
We do run daily checks over all the CRAN packages. See
http://cran.r-project.org/src/contrib/checkSummary.html
(Unfortunately although the checks have been run last week, the summary
has not been updated since Aug 29.)