According to Variety, Gillian Anderson is in negotiations to join the cast of Official Secrets,
the Harrison Ford-starring political thriller is set in 2003 and centers
around an illegal NSA plot to conspire against the UN Security Council
to ensure that the Iraq War goes according to plan. If Anderson takes
the gig, and it sounds like she will, she’ll be playing an MI6 agent who
is somehow involved in accomplishing/undermining that evil plot.
Official Secrets also stars Anthony Hopkins, Paul Bettany, Natalie Dormer, Tahar Rahim,
and Martin Freeman. Justin Chadwick will direct, and the script was
based on a book called The Spy Who Tried To Stop A War: Katharine Gun And The Secret Plot To Sanction The Iraq Invasion.
Source: AV Club