I heard that Warner Bros has bought the rights to World War X, a script written by Colin Trevorrow. Not much is know about the story, from what leaked so far it kind of sounds like Timecop:
Plot:
"The story centers on a man recruited by a team of government agents to stop a terrorist from the future who is using time travel to reshape history."
But Scriptwriter Colin Trevorrow has mostly worked on comedy movies so far, so I'm not sure if World War X is going to be a pure science-fiction film... But since Producer Joel Silver (who brought us Matrix) is attached to the project, there is hope for the movie World War X to be a real science-fiction movie, and not some stupid spoof sci-fi film.
We should get more information about the movie World War X soon!