If you want to use unstable you should install apt-listchanges then you can received what's changed in the latest upgrade like : fontconfig (2.2.0-2) unstable; urgency=low
* The "Society For Creative Anachronism Seizes Control Of Russia" release. * debian/control: - Recommend ttf-bitstream-vera, since it is the default fallback font now. Plus it does look pretty nice. (Closes: #190675). - Suggest: ttf-freefont, my favorite font.
From : http://lists.debian.org/debian-gtk-gnome/2003/debian-gtk-gnome-200305/msg00082.html