Now that Fedora 17 is out, so is a new release of Fedora Scientific. Fedora Scientific now includes Scilab (Thanks to the packagers).
— Amit Saha (@echorand) May 25, 2012
To state the obvious, If you are not a KDE person, you may go ahead and install GNOME3, XFCE, LXDE witth yum, like so:
# yum group install “GNOME Desktop Environment”
# yum group install xfce
# yum group install lxde
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