(if the subtitles don't show, click on the "CC" button)
UPDATE (2011-08-13): The video below won't work now; watch it here instead.
They've been working on this on and off for the past 9 years. The first 20 minutes were already finished in 2006. More info on Wikipedia. I can't quite understand if, according to the video, they spent the past year making a further 30 minutes, or if that includes those 20 minutes from 4 years ago.
It also looks like there's a new official website for the film (the last one was closed a while ago):
Based on the strange URL, outdated material and some non-working links, I'm guessing it's not meant to be public yet. The English and German-language versions are non-functional.
There's also a new photo-gallery that goes with this video over here.