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.