"I certainly directed those scenes with the intention that no one would know. One of my favorite moments and i think jason clarke did a great job with it is when he walks into the hospital in 2017 and everything from there until the turn, youre supposed to think, oh man, this is great. i know there was kind of a challenging calculus going on in the heads of those who market this thing to decide that this was the right thing to do. I think they felt like they had to send a strong message to a very wary audience that there was something new, that this was going to new territory. They were concerned that people were misperceiving this as kind of a reboot, and none of us wanted to reboot two perfect movies by james cameron. I think they felt they had to do something game-changing in how the film was being perceived."
when asked if he had been consulted before the trailer was released, alan taylor said that he "had a few heads ups and a few unpleasant conversations where i squawked about this or that" but in the end the revealing trailer went forward.
http://www.joblo.com/movie-news/ala...r-genisys-marketing-has-revealed-too-much-282