In general, the distinction between the threads on here is -- anything gleaned from the officially-released teasers, trailers, posters, TV spots, magazine articles, and "looks inside" that are airing in broad release aren't "spoilers", per se. They're just advertising/marketing for the film. Anything that comes from "inside sources", leaks, and rumors is over in the Spoilers thread, as it can potentially contain stuff that isn't meant to be general knowledge and could forwarn of any big twists.
Some things blur the line. For instance, a few pages back (when the US trailer hit), there was much speculation and argument over who Rey was crying over. It ran the gamut from Han to Chewie to Finn to Poe. Because Han's been rumored to die in this film since Harrison was announced to have been cast, that lent weight to those who claimed it was Dead Han in that shot. Others dissected the shot more carefully and determined that it's almost certainly Finn, almost certainly badly wounded, and absolutely certainly not dead, so no spoilers in the trailer, and the rest is conjecture. But those who had managed to miss the "Han dies" rumors for the year-plus beforehand took the speculation badly. But whether Han dies or not, come December 18th (or earlier, because we can't have a proper midnight release any more in this country), one chunk of the audience is going to be going "ha! I knew it!", regardless of the fact that nothing actually from the production has given us any info.
But those who don't even want to know as much as is in the trailers (which undoubtedly only give us glimpses into the first 30%-40% of the film, and none of the climax, I'm willing to wager) should probably avoid even this thread.
--Jonah