Hi
Verbatim copy of the release announcement for the most part but here it is
http://www.muktware.com/news/24/2011/1215
"The best features of Fedora 15, which will attract a lot of users is
Gnome 3 shell. Fedora 15 will give users a distro which will allow then
to explore Gnome 3 with the stability that Fedora 15 offers.
Fedora 15 is also introducing Btrfs as a menu item in the installer
(only for non-live images. live images support just Ext4) and does not
require passing a special option to the installer as in the previous
releases. Btrfs availability has moved up a notch as a incremental step
towards the goal of Btrfs as the default filesystem in the next release
of Fedora."
Rahul