I saw it too, thought it was extremely well done. They pieced together a nice thread of personal stories and anecdotes from British citizens and soldiers, from 1914 through 1918. The restored and colorized video was impressive too, but I'm not sure if it was because of the freshening-up or the corrected frame speed. The cartoonish look of the old films just evaporated.
I wish I'd had time to linger and see the "behind the scenes" video on how they accomplished it all.