Remember when Warner made a Green Lantern movie and wasted so much time on Earth? Marvel won’t be making that mistake with the third Thor film as most of it is in space!
On The Empire Podcast, Kevin Feige explained:
“There are only a couple of scenes on Earth in this movie; 80 to 90% takes place in the cosmos.”
The response was in question to why Natalie Portman isn’t appearing in the third movie. Most Marvel fans know about the drama that surrounded her return in Thor: The Dark World so I doubt many really expected her back for this one. But it’s a juicy bit of clickbait for sites to speculate on why she isn’t back a third time, and Marvel was smart to write the story in way that she wouldn’t even have a chance to appear in the movie.