http://www.tvshowsondvd.com/news/Voltron-Defender-Universe-Collection-6/9877 Plus the team up movie is out on dvd. The unaired third voltron series should get released later.
While this news and the news of the "Two Voltorns" (what I called it as a kid) getting a DVD release makes me all tingly inside, the article you linked ot is about Silverhawks, which I don't really care about.
The Car Team kicks major ass. I have the robot from when I was a little kid. But sadly, all the pieces are either missing or broken.