Patrick Frater Asia Bureau ChiefDelayed by over a year for mysterious political reasons, epic Chinese war film “The Eight Hundred” has finally locked down a date for release in theaters.It will open in conventional and Imax cinemas in China from Aug. 21, making it one of the first outings for a high-profile local film since Chinese cinemas hesitantly returned to operation in late July.The $80 million film was produced by Huayi Brothers and is directed by Guan Hu (Mister Six”).