The next X-Men movie is due out in theatres early next year, after being pushed back from a planned November release to allow for reshoots.
It's not clear how much new material is being shot, with star Sophie Turner – who plays the central figure of Jean Grey – telling Digital Spy that she's not sure which sequences in Dark Phoenix are being tweaked.
"I think it's just a few bits and bobs, reshoot-wise," Turner said. "To be honest, I don't even know what we're reshooting at the moment. So I couldn't really tell you much about that one.
"All I know is that I'll be back in Montreal at some point soon, and that the Valentine's Day release date is quite a positive thing, because Black Panther got released on Valentine's Day. So we're keeping positive about it."
The film is an adaptation of the Dark Phoenix Saga from the original X-Men comics, which sees telepath and telekinetic Jean Grey unlock her true potential but become unbalanced, adopting the new identity of Phoenix and wreaking havoc across the universe.
Turner promised that the movie version would be "vastly different" to the mutant team's last big-screen outing, 2016's X-Men: Apocalypse.
"This movie is kind of a lot more emotion-based, much more grounded," she enthused. "There are, of course, those supernatural elements, but this one is really character-driven – a really emotional story about a girl battling with a deadly mix of mental health problems and being a superhero.
"So it's all wrapped up into one, and it's a movie about struggle and abandonment and not knowing yourself. Yeah, an internal struggling. It's so, so interesting. It's such a departure from the last movie."
The original shoot took place from June to October 2017, with Turner describing the experience as "so emotional" and "a real tester".
"I put my heart and soul into that movie," she said. "It was so fun, but it was such a stretch."
James McAvoy, Michael Fassbender and Jennifer Lawrence will reprise their roles as Charles Xavier, Magneto and Mystique in the 1990s-set X-Men: Dark Phoenix, along with fellow returnees Nicholas Hoult (Beast), Alexandra Shipp (Storm), Tye Sheridan (Cyclops) and Kodi Smit-McPhee (Nightcrawler).
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