Bungie's new IP is coming to mobiles as well as consoles and PC, according to a job posting on the Halo developer's site.
The ad, which is for a senior mobile application programmer, invites candidates to apply to join the team and help create "Bungie's next gaming universe".
It reads: "Bungie is embarking on a new and challenging journey and if you have a serious passion for mobile application development we want you to be a part of it.
"Our mobile development team is focused on establishing real time connectivity for millions of users and terabytes of data. Join our team and define the interface of Bungie's next gaming universe to the world."
Bungie is working on a new franchise for publisher Activision. There have been some heavy hints suggesting it could feature a persistent MMO-style world.
Trademark applications for domain names that surfaced this week may hint at possible names for the new IP.