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It's been all but confirmed already in a panel with David Harbour and Millie Bobby Brown. They spoke of looking at scripts and David accidentally spoke about
when
the two of them head back to Georgia and seemed to catch himself after he said it. Millie tried to give some kind of save, but you could tell everyone knew the cat was a bit out of the bag. They also discussed the dynamic between Eleven and Hopper as a likely exploration point for next season.

"Show me the money" huh? It's possible I suppose but it might backfire on her
The Players of The Game are the scum of the earth.

Maybe they can't afford her fees now. Maybe she doesn't want to be associated with one role for more than a season and will move one.
She must be getting movie scripts thrown at her left, right and centre. This girl is hot property right now, she has to do what is best for her career.

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Although he didn't claim to know David Harbour said it'd be madness not to bring her back as she's such a huge character.
https://www.youtube.com/watch?v=TTVU0EkZKCw&t=24m55s

I guess we will know soon. Once filming begins we will either get a leak that she's filming or not. Given her popularity, even If they planned to kill 11 they will change their minds.

Sounds like the typical sort of tease between seasons that Game of Thrones gets up to. "Jon Snow is dead!" I would guess they put Millie BB up to it. That's showbiz! I think she'll be back for sure.
The Players of The Game are the scum of the earth.

She claims that she doesn't know if she's going to be back or not. I'm not sure if she's being told to say that or if she really doesn't know. She also mentioned that she has another project "in mind" at the moment.