Yeah, the trailer for TLJ totally spoiled for me that it would have characters from TFA and would have scenes in space. I didn’t need to know that!
That’s sort of the point though. Personally I only watch teaser trailers for movies and try to avoid everything else that comes after for fear of getting spoiled but there’s plenty of people who don’t want any information. If you’re going to have a non-spoiler thread then it should put those people’s wishes first.