Here's the synopsis from the website ENTERTHESOURCECODE.COM
When decorated soldier Captain Colter Stevens (Jake Gyllenhaal) wakes up in the body of an unknown man, he discovers he's part of a mission to find the bomber of a Chicago commuter train. In an assignment unlike any he's ever known, he learns he's part of a government experiment called the "Source Code," a program that enables him to cross over into another man's identity in the last 8 minutes of his life. With a second, much larger target threatening to kill millions in downtown Chicago, Colter re-lives the incident over and over again, gathering clues each time, until he can solve the mystery of who is behind the bombs and prevent the next attack.
You can see the trailer here as well.
At first glance it seems like a cross between Groundhog Day + 12 Monkeys + The Matrix, which isn't a bad thing if its done right. What worries me is when you watch the trailer, they lean way too heavily on the love interest. Then it starts sounding a bit like the Denzel Washington movie Déjà Vu and that can be a problem.
I'll reserve judgement on it until I see it or learn more about it, but I pray and hope that Jones doesn't turn into another M. Night Shyamalan, and fails to live up to his promise.
Check back in the spring for a full review of the movie.