It appears as though Geneon is no longer operating in the US, so they won't be producing the last few discs in the series. Here is more info:
http://www.animenewsnetwork.com/news...tion-by-friday
As for Kyo Kara Maoh, the series itself wasn't cancelled, as far as I know. It's just not coming to DVD here. You can download the eps by going down to the section of this forum called Anime/Manga/Game Downloads. Find Full Series and look a few pages back.
I clipped the following from wikipedia. I don't know if it is accurate or not. Maybe someone else knows more.
http://en.wikipedia.org/wiki/Kyo_Kara_Maoh!
<<<<April 7th 2007, Kyou Kara Maou! became an OVA Kyou Kara Maou! R (今日からマ王！R Kyō Kara Maō! R). The first episode of this five-part OVA was released on 10/26/2007. The second part is scheduled to be released 12/15/2007.
Episode 1「小シマロンの少年王（前編）」 (Released: 10/26/2007)
Episode 2「栄冠は誰がために」(Release around: 11/30/2007)
Episode 3「乾いた風」 (Release around: 12/28/2007)
Episode 4「愛の乙女」 (Release around: 2/29/2008)
Episode 5「小シマロンの少年王（後編）」 (Release around: 3/28/2008)
Season 3
Aside the OVA, there will be a Kyo Kara Maoh! season three released in April 2008 that will consist of 39 episodes.>>>>>>
Hope that helps! :D
Tumbleweed Crossing