According to Variety "World War Z 2" producer David Ellison has gotten his dream director for the project in David Fincher. Earlier in the year he had stated that “There’s a script that we’re incredibly happy with, and it’s just getting a couple of key deals closed… We hope [Fincher] makes the movie.”
Let's just make sure Fincher gets total creative control here. This would be Fincher's first all-out blockbuster, although, I guess, you could make a case for "Alien 3" as well. Fincher hasn't directed a film since 2014's "Gone Girl." At some point he was supposed to direct Ben Affleck in a remake of Alfred Hitchcock's "Strangers on A Train," which would have taken place in a plane instead of the titular train, but IMDB doesn't have that project listed anymore. Scrapped? Who knows. Fincher will be collaborating with Brad Pitt for the fourth time in "World War Z 2"
My colleagues over at The Film Stage has it this way:
Led by Brad Pitt, who is the main person to blame for Fincher’s attachment, having presented a reportedly compelling idea to him.