According to New Type magazine, the long delayed "Tenchi Muyo!" series "Isekai no Seikishi Monogatari" was finally confirmed. The official website indicates that the production company is AIC Spirits.
In 1998, the official "Tenchi Muyo!" web site announced that "Seikishi" TV anime will be aired from the spring 1999, but this announcement was withdrawn later. In 2004, the official web site announced the anime to be aired in the spring 2005, but this announcement was retracted again. In 2006, "Seikishi" was officially described as "Type: unknown, Airing schedule: unknown". Now in 2008, the character designs were published. The airing schedule was not given in the article.

Source: Scan of New Type magazine
Source: Official website
Source: MOONPHASE
Source: An old article about the official announcement in 2004
Source: The mechanic design of "Seikishi Monogatari" leaked in 2004

Edited on Nov 14th=============
The Official website was updated and the character designs are shown.

Synopsis:


Edited on Nov 20th==============
The Official website was updated and the staff info and a trailer are available. (click "Special" for the trailer.)

Director: Kikkawa Kouji ("Goshuushousama, Ninomiya-kun")
Series organizer: Shirane Hideki ("Shakugan no Shana")
Character designer: Watanabe Hajime ("School Rumble")
Production company: AIC Spirits ("Tokyo Majin Gakuen Kenpucho: Tou") & BeSTACK ("Blue Drop ~Tenshi-tachi no Gikyoku~")