A story published on the website Gamerzines speculates that Neversoft is currently working on a first-person shooter -- based on some job listings on the official Neversoft jobs site.
The most interesting was for a "Windows PC Platform Lead Engineer: FPS." If the job title didn't make it clear, the desired qualifications did, listing "a strong passion for and experience with First Person Shooters" and "Online infrastructure experience including Steam distribution and security and anti-cheat systems."
{GameInformer}