Fedora 21 is the product of a new effort known as Fedora Next that aims to reshape and rethink how the community Linux distribution is built and deployed.
With Fedora 21, instead of a single monolithic release, there are now three primary releases of Fedora, each targeting specific deployment use-cases. The three Fedora 21 releases are called Workstation, Cloud and Server.
The Fedora 21 release has been somewhat delayed and is the first new Fedora release since Fedora 20 in 2013. Fedora Project Leader Matthew Miller explained to ServerWatch that originally the new Fedora Next approach was set to add a three month delay to the release.