It's okay, I'm sure the FF spoiler rules are a bit new to other people too, so I thought it was worth going through them. I don't really want to be overly picky about this either, but I try to stay unspoiled myself.

Stuff that comes from actors on the show but isn't officially sanctioned by the production team is a bit of a grey area, but generally I'd consider it a spoiler. One would hope though that people involved with the show wouldn't be doing things like that, the production team is pretty careful about what details they release and when.

If something was in the trailer, that's not a spoiler. So, for example, if there was even a hint in the trailer that Davros might be involved, it's not a spoiler to speculate that Davros will return. It IS a spoiler to say you know for certain Davros will be back because you saw a picture someone unofficially posted of him on set.

If anyone is really unsure whether something is a spoiler, at minimum use spoiler tags.