Fedora Linux delays are so notorious that Fedora 14 was going to have a feature of actually being released on time but engineering set-backs led to that feature being canned. It's difficult (impossible?) to remember a time in recent history where Fedora hasn't suffered from multiple delays, but it's happened again with Fedora 18.
It was delayed already in pre-Alpha twice and now it's been delayed again leading up to the Fedora 18 Beta.
This latest delay is pushing back the Fedora 18 Beta Change Deadline by one week due to unfinished/non-testable features for the beta release. As a result of the unfinished features, all major milestones for Fedora 18 were postponed by one week.
Fedora 18 is now scheduled to be officially released on 4 December of this year after originally it was scheduled to be released on the 6th of November before encountering four delays so far. The announcement was made in this mailing list message. The Fedora 18 Beta release is now expected on 30 October and a release candidate on 21 of November.
At least the next Fedora release is being delayed in order to finish out the Fedora 18 features rather than rushing it out the door, but it's a pity that this seems to happen way too often rather than setting a more accommodating schedule in the first place. See the most exciting features of Fedora 18.
If you are looking to occupy your time while waiting for the Fedora 18 Beta, you can work on proposing a Fedora 19 codename. Among the contenders so far for the Fedora 19 codename include Ushi-Oni, Cubical Bull, Cold Welding, God's Armor, Steam Boiler, Parabolic Potassium, Prime Rib, Boiling Frog, Christmassy Halloween, Chinchilla Raisin, and Honey Badger.