I have pushed TeXLive 2013 packages to [testing].
The main difference with the 2012 packages is that /etc/texmf files
are now in texlive-core rather than texlive-bin.
The texlive-bin package now contains almost only binaries, and
texlive-core contains all basic data files including the ones in
Feel free to report any issues you encounter.
If you have an existing installation, the upgrade might install new
versions of /etc/texmf/ files as *.pacnew. It is unlikely that things
work properly if you don't handle the pacnew files unless you realy
know what you are doing.
If pacnew files appear (notably texmf.cnf and fmtutil.cnf), and the
installation reports a failure in regenerating formats (which you will
know by not being able to use an engine), you will need to handle the
pacnew files, and run "fmtutil-sys --all" by hand.
If this situation reaches a high level of absurdity, and if possible
considering pacman's behaviour, new packages not behaving like this
might be built later before going to [extra].