The trailers that people have seen related to Stranger Things season three has shown some clues on how the story will go, but some people feel that the details that they have learned are still not enough to let them know what will happen to the characters.
For example, no one knows if Eight will be back. For those who are not too familiar with Eight, this is Kali. Based on the episodes, it is evident that Kali will not be back for season 3, but there is still a chance that she will be back for season 4 so that the storyline can be solved properly. Take note that people have speculated that she would return for season 3, but this did not occur.