Thanks V!
Deadline is reporting that Exclusive Media has picked up international distribution rights for Passengers starring Keanu Reeves and now Reese Witherspoon at Cannes. No domestic sales reps have been set yet. Additional production is set to start in January 2014.
The press release is here.
Note: The article makes a point of saying the film is starring Keanu and now Reese Witherspoon so it sounds like she has definitely signed on. Back in 2010 Universal had signed on as the domestic distributor but that sounds like it is no longer the case.