The following article from Deadline seems to confirm that Gillian will be co-starring in The Spy Who Dumped Me. The movie is currently in pre-production, and is slated for a July 6, 2018 release.
French actor-comedian Kev Adams is set to make his U.S. film debut in Lionsgate’s Mila Kunis and Kate McKinnon led action comedy The Spy Who Dumped Me. Susanna Fogel is directing the pic from a script she co-wrote with David Iserson. It will get a wide release July 6, 2018.
The film centers on Audrey (Kunis) and Morgan (McKinnon), two best friends who unwittingly become entangled in an international conspiracy when one of the women discovers the boyfriend who dumped her was actually a spy.
Justin Theroux, Sam Heughan, Gillian Anderson, Hasan Minhaj and Ivanna Sakhno co-star in the film, with Imagine Entertainment’s Brian Grazer and Erica Huggins producing.