Didn't they do something similar with the first Phantom Menace trailer? And even that was uploaded to the internet?
https://www.youtube.com/watch?v=DqcrzE9pZOQ
Now we have youtube and smart phones that can record video at 1080p. We will all be seeing this trailer on Friday. I'm not sure what the logic is behind a limited release of a TRAILER to a handful of theatres like this in 2014.