Stranger Things...

[Fla Dem]

2. I can't find info on cancelling after season 3.

Although seeing that S3 is not being released until summer 2019, which would make a season 4 maybe summer of 2020. So it would make sense as the kids would have aged a bit. Millie Brown who plays "Eleven" was 12 when they started filming. She'll be 16 if they do a S4, as will Noah Schnapp who plays "Will Byers". Kids grow up a lot in this age range. Voices change, they get tall etc.

But having said that, I did find this article published on 8/1/2018.

‘Stranger Things’ 3: Release date, cast, trailers, plot hints and more

<<snip
When will Stranger Things 3 be set?
Speaking to Collider, producer Shawn Levy said that the show is likely to be set a year after Season 2’s conclusion, so during the summer of 1985.

The Duffer Brothers also suggested that the new episodes will have to deal with the kids’ growing up and puberty.

<<snip>>

Will Stranger Things Season 3 be the final episodes?
Judging by the comments by The Duffer Brothers to Vulture, they’re “thinking it will be a four-season thing and then out”. So as Season 3 progresses, we’re likely to see some kind of end-game for the show starting to rear its head.

More>>>

https://www.nme.com/blogs/tv-blogs/stranger-things-season-3-release-date-trailer-plot-2127430#bDfHGwLuKzmFVl0C.99