We are currently utilizing preseed and postinstall functionality for an automated USB stick installer of Xubuntu 12.04.2, and would like to upgrade to 13.04 (via fresh install; we'd like to avoid do-release-upgrade).
From what I've been told, the preseed/postinstall functionality only works for alternate installer ISOs. I've been checking weekly since 13.04 was released for an xubuntu-13.04-alternate-amd64.iso release, but I've yet to find one.
Are there plans to release it? If not, I suppose I could use a Ubuntu alternate ISO and manually remove gnome and install XFCE, but I'd like to avoid that if possible.