The Mempo Project is still aiming to provide the "most secure and yet comfortable out-of-the-box Desktop and Server" operating system powered by Debian.
Mempo is a project started in H2'2013 that's been trying to provide a secure yet robust Debian platform that currently classifies itself in a "pre-alpha" state. Mempo is patching Debian packages with better security and privacy, providing newer versions of packages than what's found in Debian, using a hardened "GrSecurity" Linux kernel, and is working to support other work in and outside of Debian.
Mempo is playing around with VM isolation, Tor and Freenet for networking among other components, OTR and GnuPG for encryption, and also is looking to provide better user education about security and privacy.
Those security-minded Linux users wishing to learn more about the ongoing but slow work on the Mempo Project can visit the Debian Wiki
for more details on this early, few-month-old project.