Looks like we may get some more casting news for The Host soon! Deadline is reporting that Jake Abel is the frontrunner to play Ian in the film:
Actor Jake Abel is frontrunner to play one of the two male lead roles in The Host, the adaptation of the science fiction novel by Twilight author Stephenie Meyer that will star Saoirse Ronan and be directed by Andrew Niccol, who wrote the script. Negotiations are expected to begin soon. Abel was chosen from among a group of young thesps and he is negotiating for the role of Ian.