Akira Toriyama (author of Dragon Ball) and Masakazu Katsura (creator of I''s, character designer of Tiger & Bunny) will be doing a collaboration
on a new manga project together.
It was revealed that mangaka Akira Toriyama, the original creator of Dragonball, will start a new manga series. He will be coming up with the story for the series while mangaka Masakazu Katsura, the original creator of I''s,
will provide the illustrations. The announcement was made by Kazuhiko
Torishima, Akira Toriyama's editor, on the Mandou Kobayashi television
show.
In April 2008, both authors collaborated on a one-shot titled Sachie-chan Guu!!. In 2009 and up until 2010, the pair also worked on a 3-chapter project titled JIYA.
Collaborate Source: Interview video
News Source: http://myanimelist.net/forum/?topicid=1377109