The studio's take on Christie's life would see her eschewing a quiet time as a wife during her younger years, instead choosing to spend time with contemporaries such as Winston Churchill and Sir Arthur Conan Doyle.
Vikander is only considering the role at this time, but there is some added impetus to get the movie going, as Paramount Pictures currently have their own take – simply known as Agatha right now – that has been been bubbling away in development for a few years. When we last heard about it, the project had Will Gluck (Easy A) attached to direct a film about the time the legendary mystery writer went missing for 10 days in 1926. No mention is made of the director in The Hollywood Reporter's feature, but the trade mag does mention that Emma Stone (The Help) is top of the wish list to play the young Christie, so perhaps his influence is still being felt.
Before anything can really happen, however, there is the matter of approval from the Christie estate – indeed, the team behind Murder On The Orient Express went through seven years of legal negotiation before the Branagh version could even be considered. So whichever project makes it to the post first will likely be the one to win the stamp of approval from the Christie family.