Meanwhile the german documentary "Heavy Metal trifft Karniggels" has been uploaded to this location. Having taken a look at the stuff it seems to me that the documentary stuff has been left in but the videos from the band performances have been cut out. Guess that's because of legal rights missing to stream this stuff. Anyway, nice they did put this one up at least as (optional HD) flash videos and additionally also as Windows Media Stream in three qualities.If you want to know more about the director Detlev Buck, there is another german sub-website from NDR station describing his life and work quite in detail.
In addition to this they also did set up a subpage with all the performances of the bands that played at the "Wacken metal battle" Contest. So if you saw a band there that you liked a lot or just wanna checkt out some fresh new bands, this is the place for you to go. I counted 17 videos on that page. Great so see they support young bands that much.
If you like to see some interview footage (in german language) there's pretty much online from Wacken 2012. You can see bands like Overkill, Paradise Lost, Hammerfall, In Flames and more talking about their performances right here.