Discotek has announced on their facebook page that they have licensed the first season of Lupin the 3rd for release on DVD in the Spring of 2012. The 23 episode 1971 first season has never been released before in Region 1. The first season is famous for having more than half of the episodes, including all of the later episodes, directed by Hayao Miyazaki and Isao Takahata of Studio Ghibli fame.
Geneon USA had previously licensed and partially released the 1977 second season/series on DVD. A new Lupin the 3rd series has also been announced to air this fall in Japan.