I upgraded my macbook air from Fedora 14 to Fedora 15 by preupgrade.

During the upgrade process, I faced RHBZ 579114. According to that report I had to stop using tmpfs on /tmp . When I stop using tmpfs and reboot mba, preupgrade could run correctly also I needed to run 'gptsync' from rEFIt shell after preupgrade process was finished.

This picture is my mba's screen. It seems that graphics(kmod-nvidia), wifi, touchpad are work fine so far.