The Marvel movie is set for release on April 27 in the UK, with the sequel due the following year.
Both have wrapped, but will we get another surprise comeback in the mix?
Natalie Portman was last seen as Jane Foster in Thor and its sequel, but had exited the franchise by Thor: Ragnarok, which came out in October last year.
So will she come back, or is Jane firmly stuck in the past?
The Oscar winner has insisted that there are officially no plans for her to reappear in the immediate future – but it’s certainly not impossible.
“As far as I know, I’m done,” she told the Wall Street Journal.
“I don’t know if, maybe, one day they’ll ask for an Avengers 7 or whatever.
“I have no idea! But as far as I know I’m done.”
Portman never showed up in either of the past Avengers movies, and the fact that Thor’s narrative seems to have progressed beyond his relationship with Jane renders a comeback unlikely.
But it’s certainly not off the table for definite – and as Portman herself said, Jane could always make a reappearance further down the line.
Avengers: Infinity War is out on April 27.