While not really signified by the version number, DNF 0.4.13 has with it many new features as it still works towards parity with Yum. The major changes found in DNF 0.4.13 are Delta RPM support, bash completion, and the "keepcache" configuration option has been restored. There's also bug-fixes as part of this new DNF version.
More details on DNF 0.4.13 can be found via the release notes on GitHub.
DNF is still showing mixed feelings by Fedora users and has been declared ready for user testing but will not become the default on Fedora Linux until at least Fedora 22 but Fedora 21 will likely use Hawkey.