Lubuntu 14.04.3 Amd64 DVD, the new download media does not represent a separate new release, rather it provides fresh installation media with up to date packages and bug fixes.

About Lubuntu
Lubuntu is a fast, lightweight and energy-saving variant of Ubuntu using the LXDE (Lightweight X11 Desktop Environment) desktop. It is intended to have low-resource system requirements and is designed primarily for netbooks, mobile devices and older PCs.