Apparently the Duffer Brothers and Netflix took some serious precautions to keep things under wraps, and with Harbour (who has accidentally revealed some secrets in the past) in check on not wanting to reveal the big moment, hopefully those secrets will remain safe until release day.
David Harbour’s reveals are about the most information we’ve gotten on Stranger Things Season 3 outside of trailers, as not a lot has leaked out to fans on this upcoming season.