"The alpha uses Linux kernel 3.0, but versions released from late
September or early October are expected to move to version 3.1. It
includes the alpha version of KDE Plasma Workspaces 4.7.0, and GNOME
3.1.5 will provide a foretaste of GNOME 3.2. The development team has
also replaced further init scripts with systemd units. Systemd replaced
upstart in Fedora 15. The planned switch to using Btrfs as the default
file system has been deferred to a future version."