People, this is not a Titanfall rip off. See,
The game's
development team began work on the title in 2011, and their Titan
concept grew from a human-sized suit into a battle tank exoskeleton. The
team sought to bring "scale, verticality, and story" to its multiplayer
genre through elements traditionally reserved for single-player
campaigns.
Pre-production began in 2011, and
Respawn's first game was originally planned for existing consoles.[33]
The idea for the game did not come easily, and the team arrived at its
multiplayer-only and human-mech focus after much internal debate.
http://en.wikipedia.org/wiki/T...
However, it was announced that Sledgehammer Games will not be
developing Call of Duty: Advanced Warfare for the PlayStation 3 and Xbox
360; instead, High Moon Studios will be developing the PlayStation 3
and Xbox 360 editions. It is the first game in the series to be created
in a three-year development cycle, rather than two years as in previous
Call of Duty games.
Before being switched to become
the co-developers of Call of Duty: Modern Warfare 3, Sledgehammer Games
were already working on a Call of Duty game. This game was announced
before Modern Warfare 3 and after Black Ops, however, no details were
released.
http://en.wikipedia.org/wiki/C... ... ed_Warfare
Conclusion
Both games are being developed since 2011.
Both of them had the idea of exoskeletons, Respawn used it earlier.