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.