People all over the world have been enjoying watching the amazing trailers that were shown recently at Comic-Con. It's definitely been an exciting few days, but Warner Bros. appear to be somewhat disappointed.
Not only was Suicide Squad's trailer released in full, but so was the Batman V Superman trailer. The same happened last year when the Avengers: Age of Ultron trailer was leaked.
I understand how much the movie studios want to create a unique experience for those visiting Comic-Con. Sometimes VFX shots aren't quite finished, and so aren't necessarily ready to show to the rest of the planet. Even so, the chance for them to tease, entice and treat people at Comic-Con to exclusive trailers is a fantastic experience, but I think that era is coming to an end. As each year progresses, containing this kind of stuff is going to become far more challenging, if not impossible.
Ultimately, I wouldn't be surprised if studios will end up just biting the bullet and start releasing the official footage the day after.