I'm frankly blown away by the preview of this film.
Basically, Peter Jackson hired researchers to locate all the WWI film footage they could. Of course at the time, it was all silent, grainy, black and white film. Because alot of the cameras were hand cranked, the frames per second shot were variable and poor quality.
They basically were able to computer and hand process this old footage into high definition, colorized film. Then, he hired professional forensic lip readers to determine what the soldiers were saying and had voice actors fill in the missing voices. He also tracked down as much of post war interviews as he could of original soldiers.
With that... he made a documentary bringing to life the soldiers of the Great War. The result is just stunning and amazing.
Check out the trailer: