To echo what Beantown said, the "rule" here has always been to spoiler tag anything that is not directly related to what's already been viewed on an aired episode.
So, if there's a comic: you spoiler tag it. If it's about a preview: spoiler tag. If it's something about how many episodes a character will be in: spoiler tag.
This is not to be confused with assumptions or guesses. If you think (as in you haven't read it elsewhere) something is going to happen, you don't need to spoiler tag it.
I don't know why guys spoiler tag things that happened in an aired episode. It's not necessary and it causes too much confusion.

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