Today, the Linux Mint team announced the release of the LMDE 2 “Betsy” MATE desktop as well as the Cinnamon desktop environments.
LMDE (Linux Mint Debian Edition) is a very exciting distribution, targeted at experienced users, which provides the same environment as Linux Mint but uses Debian as its package base, instead of Ubuntu.
LMDE is less mainstream than Linux Mint, it has a much smaller user base, it is not compatible with PPAs, and it lacks a few features. That makes it a bit harder to use and harder to find help for, so it is not recommended for novice users.
Important release info, system requirements, upgrade instructions and more can be found about these releases directly on Linux Mint website.