DNF is the experimental fork of the Yum package manager
that premiered in Fedora 18. While much hasn't been heard of this experimental Yum replacement since its debut, work on it has still been progressing and is turning out to be in great shape, is slowly approaching feature-parity with Yum, and is faster.
DNF hasn't come to mind since last writing about it
in 2012, but development has progressed and on Fedora 18/19 it still can be tested in parallel to Yum. Re-sparking interest in DNF is a new blog post
on the Fedora-Next blog about DNF.
In today's post, it reiterates that nearly all the command line options are the same as Yum and none of the DNF configuration options have changed. To the advantage of DNF, the performance is already "much better compared to yum" as it leverages openSUSE's libsolv library. Among the missing features right now are unfortunately support for Delta RPMs, history undo, parallel downloads, auto-remove, bash completion, and various group commands.