CME is short for the Config Model Editor and it provides a GUI for editing package files as well as a command-line utility to modify and check the package files. CME is meant to work with more than just Debian and thus uses a plug-in architecture with the DPKG plug-in adding in the Debian packaging bits. Those wishing to learn more about CME with dpkg support can see this GitHub page that also includes some screenshots of the Config Model Editor GUI.
This new tool was mentioned today in the debian-devel-announce news message. Today's message also reminded Debian maintainers to begin planning for Debian 9.0 Stretch. They continue to expect freezing Debian Stretch in the fourth quarter of this year.