At Jump Festa 2011, the fourth season of Ring ni Kakero 1 "Sekaitaikai Hen (World Championship Chapter)" was announced to be aired on Animax channel from next April.

Ring ni Kakero 1 Sekaitaikai Hen official website

Staff
Series Director: Ikehata Hiroshi (episode director of "Fullmetal Alchemist: Brotherhood")
Series Composition: Kuroda Yosuke
General Animation Director: Ichikawa Keiichi (assistant general animation director of "Digimon Xros Wars")
Character Designers: Araki Shingo, Himeno Michi ("Yu-Gi-Oh!" series), Ichikawa Keiichi
Production Studio:Toei Animation

Cast of new characters
Scorpion: Midorikawa Hikaru
Don Giuliano: Kuroda Takaya
Helga: Yuuki Hiro
Apollon: Miki Shinichiro
Theseus: Nakai Kazuya
Icarus: Kisaichi Atsushi
Orpheus: Shimono Hiro

The previous season "Kage Dou Hen" was aired last Spring.

Ring no Kakero 1: Sekai Taikai Hen on MAL