You can pre-order the completed movie on their kickstarter website. It says about May availability on the website.
I was lucky enough to share a sunset with them at Rae Lakes. They remembered me and invited me to a screening of their movie. You know how your photos never look as good as being there? Well they solved that problem at the expense of their backs by carrying a lot of equipment out there. Amazing photography.
Like JeffH says these are just ordinary folks that got together and decided to do this. Funding came out of their own pockets. This is not your usual testosterone infused adventure movie. It's about a group of average hikers doing something that is pretty hard, but not quite out of reach for most people. They just happened to get the experience down on film which ended up being part of the story. Of course it helped that they happen to be very good at the filming part and just average at the hiking part. I think that's what makes it appealing. They did something really hard and came up with a beautiful film.
Can't wait to get my blu-ray version!
http://www.kickstarter.com/projects/themuirproject/mile-mile-and-a-half-a-feature-documentary