cups-filters uses DBus in two components: 1. for color management via colord; 2. in cups-browsed for connecting to avahi, cups, networkmanager via DBus. However in cups-browsed DBus is accessed indirectly via glib (BTW, should cups-filters depends on glib[dbus]?). So, currently dbus use flag enables colord support in cups-filters.
Ping.
Pong
It seems like it doesn't actually depend on colord which might be confusing, but I can see the case for renaming the flag. Pacho?
I don't have any preference on this :/