DNF has graduated to version 0.4.1, which isn't a huge milestone but still showing signs of progress for this Yum package manager replacement in the Fedora / Red Hat world. DNF 0.4.1 has improved support for the Anaconda installer and has code changes to get the project on the path to supporting Python 3.
The Hawkey package management library has preliminary Python 3 support already and a Red Hat developer is working on porting DNF to Python 3 while another new Red Hat developer tasked with working on DNF is responsible for transaction undoing/reverting, as mentioned in today's mailing list message.
More details on recent changes to the DNF package manager can be found via the project release notes. The code to DNF can be fetched from GitHub.