I'm guessing they are going to create a new universe and make it into an FPS RPG. The setting would be some form of futuristic earth-like realm. All of this fitting very nicely into a esport designed package. They can sell the game to single player people based on the RPG and they can keep the name out there with the FPS esport support.
Honestly, it's really an interesting bill that one company has 3 extremely successful games in 3 completely different markets. It will be even more interesting if they can go into a 4th market of gamers.