At the Fedora 21 Final Go/No-Go Meeting a few minutes ago, Fedora QA, Release Engineering, and Development agreed to Go with the Fedora 21 Final. (See the official announcement from Fedora Program Manager Jaroslav Reznik.)
Fedora 21 will be publicly available on Tuesday, December 09, 2014.
If you’re into procedural details, you can read the meeting minutes. Otherwise, get your computers prepared, along with celebratory $BEVERAGE of choice. As Jaroslav says in his message, this is a huge achievement and a very exciting Fedora release. Thank you and congratulations to everyone who made this happen!