In a new interview for Variety‘s Showrunners Sitdown, Stranger Things creators and showrunners Matt and Ross Duffer teased what fans might expect from their top-secret spin-off project – which has been neither formally announced nor confirmed by Netflix.

The first rumblings of a spin-off emerged when it was announced season 5 of Stranger Things would be the series’ last, and the Duffer brothers stated that “there are still many more exciting stories to tell within the world of Stranger Things; new mysteries, new adventures, new unexpected heroes.”

Asked whether they would wait until the final season was completed to tackle the spin-off, the Duffers stated they probably would. “There’s a version of it [the spin-off series] developing in parallel [to season 5], but they would never shoot it parallel. I think actually, we’re going to start delving into that soon. As we’re winding down and finishing these visual effects, Matt and I are going to start getting into it,” stated Ross.

His brother adds: “The reason we haven’t done anything is just because you don’t want to be doing it for the wrong reasons, and it was just like, ‘Is this something I would want to make regardless of it being related to Stranger Things or not?’ And definitely. Even if we took the Stranger Things title off of it, I’m so, so excited about it.”

However, Matt teases, “it is not… it’s going to be different than what anyone is expecting, including Netflix.” It seems the only person – asides from the show’s creators – who might have a clue about what’s going on is series star Finn Wolfhard.

“Finn Wolfhard, he wasn’t spitballing, he just went, ‘I think this would be a cool spin-off,'” Ross Duffer recalls of the moment when the actor correctly guessed what the spin-off would be. “And we were like, ‘How in the world…'”

But that is all the directing duo would say about the matter. For now, audiences have the mega-sized Volume 2 episodes of Stranger Things season 4 to look forward to, releasing July 1st on Netflix. Check out the trailer here, and read our thoughts on Volume 1 here.