Respawn Entertainment has registered a trademark for 'Titan,' which also happens to be the codename for a new Blizzard game too.
Obviously Respawn's founders (formerly of Infinity Ward) had a rather large falling out, while Blizzard is a large part of Activision. Coincidence or perhaps one last dig from the former Activision employees? Who knowns.
In any case, Respawn's game, presumably now known as 'Titan,' is said to be a sci-fi based FPS, although little is currently known of the game. images for me. Blizzard's 'Titan' is just a codename from a project heard of back in 2010.
We should hear more on Respawn's game, which is presumably 'next gen,' at this year's E3, or perhaps even before if Microsoft announces its new console and decides it wants it as part of its showreel.