"I am working on a movie now that is... situated in 1914. Basically, Indiana Jones-ish you could say, but also Hitchcockian," he explained in a recent interview with MTV's Josh Horowitz. "We are scripting it. It's an idea that exists already... from another medium, and so we are making it now into a film narrative." Which medium, Josh asked. "A game, a video game."
However, the director wouldn't reveal which game it was.
"The writer of the video game has asked me to keep [the identity of the game] secret until he has a script."
Here is how Wikipedia describes the game:
Set on the Orient Express in 1914, the player takes on the role of Robert Cath, an American doctor on the train's final journey from Paris to Constantinople (modern Istanbul) before World War I. Cath, already wanted by French police as he is suspected of the murder of an Irish police officer, is contacted urgently by his old friend Tyler Whitney, to join him on the Orient Express, gateway to the East, and a possible exit from all his troubles. Cath boards the train via a motorcycle and looks for Whitney, who is already on board. However, from the moment he steps onto this luxurious train, Cath becomes involved in a maelstrom of treachery, lies, political conspiracies, personal interests, romance and murder..
It seems that with Mechner's screenplay for Prince of Persia recently completed, and the subject matter of "The Last Express," that could very well be the property that Verhoeven is working on.