Spoilers are dilemma. So long as those who know are tightlipped, in theory it's all a fun game of deductive reasoning based on what pieces of the puzzle are purposefully put out there.
Right now, is the time and place to decide whether or not anyone needs to stay away... if they want to remain 100% free from knowing too much. I mean, a month from now they'll be press screenings and journalists who won't be able to contain themselves. Even if they think an article is free from spoilerific detail, a hardcore Star Trek fan will spot something for sure.