I have mixed feelings about the news that Ridley Scott is re-shooting scenes for Blade Runner. Tinkering with something so long after the fact, well, it seems like it would be hard to retain the original vision - much less match scenes to the older movie.
But I'm also intrigued. Blade Runner is easily one of my favorite films of all time. In fact, I've watched it more times than any other single movie. (Though Buckaroo Banzai comes close.)
There is a good British documentary about Blade Runner, called On the Edge of Blade Runner. It runs about an hour total. Enjoy.