Andrew Z wrote:

>  just curious if you know the time-frame for 4.10 hitting the SL in
> packaged form :) ?

Probably no time soon, since it apparently requires newer versions of
Gtk+, Glib etc than exist in SL 6.

http://docs.xfce.org/xfce/building
  Xfce 4.10 requires Gtk+ 2.20 and Glib 2.24

SL6 has 2.18 and 2.22.