I have the same problem after preupgrade on Acer Aspire One. Will try either downgrade Network Manager or removing some connection files. For those that don't have network and wish to do work with yum, you can always plug in good old ethernet cable and (as root):
and voila! Of course you can manually enable your wireless connection too, but it'll involve configuring wpa_supplicant and the likes, a bit too unwieldy for some.