Erica will be a series regular
Yeah, Lucas' little sister (Priah Ferguson) will be back with more one-liners. (And an army of friends, to boot!) From Netflix: "No longer content with sitting on the sidelines, Erica finds herself on a wild mission to save Hawkins from a dangerous and unexpected new threat."
There will be a new character called Robin...
...played by Ethan Hawke and Uma Thurman's daughter, Maya! She's "an alternative girl who is equal parts sharp and playful. Bored with her mundane day job, she just wants a little excitement in her life... and gets more than she bargained for when she uncovers a dark secret in Hawkins."
Dr. Martin Brenner might resurface
Where the heck did this guy go? Not to the grave, per the creators. "I would say that if we were going to kill Brenner... as an audience member watching the show, if that was his death, that would be very unsatisfying to me -- when the monster jumps on him and we cut away," Matt told IGN last year. "He would deserve much more than that as an ending. So yes, there's a possibility of seeing him again."
Mike's mom is getting a bigger role
Perhaps the most intriguing post-Season 2 tease has been that of Mike's mother, Karen Wheeler. Her romantic subplot with Billy was minimized and shelved for the future, and with unhappiness brewing, the writers have said she's going to be especially vulnerable in Season 3. "We have much more story for Karen that is linked to her discontent and her dissatisfied sexuality," Levy told Glamour. "We're not done with Karen Wheeler and her failing marriage."
Another beloved character will die
With death to Barb (Season 1) and Bob (Season 2), this show is slowly becoming Netflix's version of Game of Thrones torture. Will Season 3 say goodbye to a new face? An old face? Another person whose name starts and ends with 'B'? "I don’t know [who]," Matt told Variety last year. "We have some ideas, but it’s all too early." Speculate and plan accordingly.
Stranger Things is going to Universal Studios
It's true! For Halloween Horror Nights, beginning select nights on September 14. Sure, this isn't exactly story-related -- and if you attend, you're probably not going to get a jump on any spoilers, per se -- but we thought it might be a nice way to kill the time till ST3.
Most importantly: Will Season 3 be a dog season or a cat season?
Justice for Chester.
This post has been updated throughout.