The Fedora 20 release will be delayed by at least one week, due to unresolved blocker bugs. The decision was made at the Go/No-Go meeting held on Thursday, 5 December. Jaroslav Reznik announced the slip later on Thursday.
Before a Fedora release (including alpha and beta releases) is approved, the project holds a Go/No-Go meeting to review existing and proposed blockers and decide whether the release is ready to ship or if the schedule needs to slip.
The next possible GA date is 17 December, pending the results of the Go/No-Go meeting to be held on 12 December (Thursday) at 17:00 UTC in the #fedora-meeting-2 channel on Freenode.