It seems that working on two new upcoming games isn't enough for 343 Industries - the developer is currently hiring for a senior producer on a "new project line" set in the Halo universe:
"343 Industries is looking for a Senior Producer to help develop a new project line in the Halo universe. This is your chance to work on one of the most exciting and creative intellectual properties in the industry with one of the industry's most talented teams.
As a Publishing Senior Producer, you are core to aiding the productivity of your development partner."
As TotalXbox reports, the developer is also looking for a new concept artist, which adds weight to the idea that 343 Industries is working on an as yet unannounced Halo project.