Fedora 18 Beta codenamed Spherical Cow is going to be delayed by another week. This is mainly because of unfinished/non-testable nature of its build. The decision was taken in Fedora 18 Beta Change Deadline readiness meeting and its expected that this delay will make the beta release possible soon.
Jaroslav Reznik a Red Hat employee wrote:
Today at Fedora 18 Beta Change Deadline readiness meeting it was
decided to push back Fedora 18 freeze by one week due to
unfinished/non testable functionality required for the Beta release.
Agreed: Due to upgrade functionality not being in a testable state,
push schedule 1 week to allow it to land before entering beta freeze
Earlier Fedora 18 has already been delayed 3 weeks due to earlier bugs.