Respawn's Single-Player Adventure Plans

A job listing on the Respawn Entertainment Website reveals the developer's plans for an unannounced single-player adventure. Looks like we missed notes about this that popped up last week, so this is a quick catch-up. There are scant clues scattered in the post with hints, saying it seeks someone with interest in "overall mission design, enemy and friendly design, combat, cinematics/narrative," later going on to say experience with level editing packages such as Unreal or Unity is "a big plus." Here's the overview:
This new singleplayer title is a designer’s dream playground with a freedom to innovate made possible by the unique universe it inhabits. Our critically acclaimed, multi-platform games have always established a “fun comes first” sensibility in a design process that allows creativity and new ideas to shine.