Most likely about a month after the pre-orders ship...that's kinda the advantage to pre-ordering, you get it before people who are waiting for the itunes download or whatever.
And...if you don't want to pay for the movie...DON'T FUCKING WATCH THE MOVIE...it's that simple, I'm proud to say the I've pre-ordered 5 movies this year, and I ordered 5 last year...and STILL bought digital copies of those movies just so I could have high-quality versions on my computer while on trips and so that I could support the film makers (hell - I bought the Refresh Digital Steam TWICE - it was by accident, but I didn't complain one bit about it). Are the prices for these movies high..yeah, but they are what helps me get really pumped in the fall getting ready for the winter, so it's worth it to me. If you can't afford to buy the movie, maybe your friend has a copy you can watch, but please DON'T download them without paying for them, you are LITERALLY stealing from people that we all personally know...you are stealing from the filmers, producers, athletes and photographers that make this industry what it is today - most of these people don't make very much money at all and for you to take away from them is just completely wrong. I know you're thinking "oh, it's only one person downloading one movie" or "it's only $20" but damn, these people work hard for that money and deserve EVERY PENNIE if not MORE!