The following information was provided by the package's contributor.
Name of contribution: expl3
Author's name: LaTeX3 Project
Location on CTAN: /macros/latex/contrib/expl3
Summary description: Packages supporting LaTeX3 programming conventions
License type: lppl
Announcement text given by the package's contributor:
This is an intermediate release, to fix an issue with the calc package
and l3calc. The original calc implementation truncates on INT
division, but l3calc rounds instead. This change of behaviour can lead
to unexpected results. As an immediate fix, expl3 no longer loads
l3calc, which is still available as a stand-alone unit.
thanks for the upload. i've installed the files and updated the
catalogue repository.
Users may view the package catalogue entry at
http://www.tex.ac.uk/tex-archive/help/Catalogue/entries/expl3.html
or they may browse the package directory at
http://www.tex.ac.uk/tex-archive/macros/latex/contrib/expl3
the catalogue entry on the web will change overnight. a bit...