They cant do the same for trek because of JJ’s obsession with everything been tight lip . It could as well backfire on Paramount and hurt the film's commercial success.
I can guarantee you that Joe Average - the person who's money will make up most of the movie's box office - doesn't know or care that there isn't a trailer yet for Star Trek. Nor does he care about the "over the top" secrecy being employed by JJ and his staff. Get a grip.