What bugs/issues are you noticing in Xfce that cause you to want an update? Because someone posted a question about an issue on the Xfce home site's forum and Jérôme quickly posted an update. Therefore, if you have an issue for which you have seen no update, I would tend to assume it's because no one has told him about it.
--- Mint 17.1 Xfce 4.12. If guns kill people, then pencils misspell words, cars make people drive drunk, and spoons made Rosie O'Donnell fat.