We?ve searched the internet for all the film casting news you need to know and compiled only the must-see roles. There?s new stuff on the way for Michael Keaton, Jennifer Aniston, Jason Bateman and Jason Segel! He?ll be playing a Cold War veteran who teaches the young assassin everything he needs to know. [Deadline] Jason Segel is replacing Nicholas Hoult in the lead role for The Discovery, a science fiction love story set two years after concrete evidence of an afterlife has been uncovered.