The Shaman King anime series started in 2001 and ran for 64 episodes in Japan. Then, 4Kids picked it up and it aired in the US and around the world. No, there is no news about any more episodes and I would say the chance of them making more is about zero.
The last volume (32) of Shaman King was slated for a Dec 3, 2004 release in Japan. I don't know if it was ever released. Anime News Network reported late last year about how the manga was under strain and they weren't going to publish the last volume unless 50,000 people responded.
The manga ended at chapter 285 in Japan. In addition, Takei wrote a few chapters about Yoh and Anna's son, Hana, in the sequel "Funbari no Uta."
Recently, Takey said that he was thinking about doing another volume(33) 'cause the end of the manga was very incomplete.
Though the t.v series is practically over, the exciting manga storyline continues.
Shaman King Fan 2: Yeah, the t.v series was tight, but the manga storyline is pretty different.