Yes I am very excited for the next season of Netflix's Stranger Things. I've enjoyed the series since the first season came out and the third season left us hanging on a big mystery. What was Hopper's fate after seemingly sacrificing himself to save everyone else and stop the Russians from opening another portal to the Upside Down.
At the end of that season there was a final seen where they were in a Russian prison. They guards/soldiers were talking about "the American." We could only assume that it was Hopper, and this new teaser proves this.
The fourth season of Stranger Things will be out later in 2020, but not date has yet been given. All we know is that we're not in Hawkins anymore.