I wonder how many people have the equipment time and know how to download it though. I can't imagine nerds of that stripe wouldn't go see it in theater anyway. Though that may slightly impact DVD sales.
I don't understand why people would bother to illegally watch a movie on their computer screen, when it only costs $5 or so to see it in a real movie theater.
At least at this point ... I see that you might save a few bucks compared to buying the DVD.