We know that the untitled film is set in 1914 and that it is both "Indiana Jones-ish" and "Hitchcockian", but sadly that's about all we have to go on. Those last two bits, though seemingly incongruous considering Indiana Jones isn't exactly Hitchcock fare and vice-versa, could leave us open for plenty of guesses, but the 1914 time frame really throws me off (though /Film may have nailed it). If it were set during the War to End all Wars instead of The Great War, that would free up a possibility I wouldn't mind seeing.
Given that his last film was Black Book, a WWII thriller about a female member of the Dutch resistance, I'd love to think that he continued that femme-fatale trend with a big screen version of Velvet Assassin, Replay Studio's stealth action game loosely based on the life of real life spy Viollete Szabo. I wasn't a particular fan of the game, but that was entirely due to the gameplay mechanics and not story. As a film I think it would work quite well - Szabo's story has already been told once in the 1958 film Carve Her Name With Pride - but again, that's just my wishful hoping.
I wish I could think of any video games set in 1914 that have actual plots, but I'm drawing a blank here. Any suggestions?