I have to say, I am absolutely stunned by this news. Never would I have guessed that they would do this. When I first saw a post about it, I thought it was trolling.
There are a lot of ways for this to go wrong, so I’m not exactly excited as of yet. Portman has been praised for many performances (including by the Academy, to be sure), but she’s not known for comedy. (Maybe we’ll be pleasantly surprised) And I felt the slapstick tone of Thor: Ragnarok undercut the story. (I don’t begrudge the legions of fans who loved it. It’s just that the appeal baffles me.) So it could all come off as a farce and make Foster look ridiculous.
I’m also a little concerned the scientist aspect of her character will fall by the wayside because of everything else they have to cover. That was something that I always treasured. I hope that her knowledge of portals will be useful.