Linux Mint 17 is a long term support release which will be supported until 2019. It comes with updated software and brings refinements and many new features to make your desktop even more comfortable to use.
New features at a glance:

Update Manager
Drivers Manager
Login Screen
Language Settings
Software Sources
Welcome Screen
MATE 1.8
Cinnamon 2.2
System Improvements
Artwork Improvements
Main Components
LTS Strategy

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About Linux Mint
Linux Mint is an Ubuntu-based distribution whose goal is to provide a more complete out-of-the-box experience by including browser plugins, media codecs, support for DVD playback, Java and other components. It also adds a custom desktop and menus, several unique configuration tools, and a web-based package installation interface. Linux Mint is compatible with Ubuntu software repositories.