A Long-Term Support version of cPanel & WHM has the following attributes:

cPanel will apply critical security fixes to this major version throughout its lifespan (at least 18 months). Feature updates will be limited to changes that improve compatibility with later versions.

The Long-Term Support aspect of version 11.30 will be important to users whose servers run operating systems affected by our new

End of Life Policy: http://docs.cpanel.net/twiki/bin/view/AllDocumentation/InstallationGuide/OperatingSystemEOL

cPanel will not provide licenses for new installations of any Linux system that has reached end of life, as defined by the new policy.