We deal with these as soon as we see them, but remember we're not omniscient. In the coming days, use of the Report button is extremely helpful to us. (And technically, threads like these are kind of a no-no, as well...)
Sometimes people think it's fun to spoil stuff for everyone when they discover content early. When the Harry Potter books would release... people would go to the end of the books and post huge spoilers. It's an ugly side of the internet :shrug:
I'm not sure which thread you're referring to, so I can't confirm or deny what was said (nor would I).