The DNF 0.6.1 release adds full support for the history redo command with integration for the repository-packages commands. DNF 0.6.1 also adds new configuration options pertaining to GPG keys/checking and there's many bug-fixes.
Last but not least this release adds a dnf-yum package that provides a /usr/bin/yum as a symlink to DNF.
More details on the DNF 0.6.1 update can be found via the release notes. DNF is expected to replace Yum in Fedora 22 but that is still subject to change.