Based on what we know I would expect treyarch's next game to span multiple timelines. Treyarch has hinted at WWII many times, and Frank Wood's actor has stated he is part of the project on twitter. This is where he would like Wood's to go. I personally wouldn't mind if treyach's next game is WWII only, but time will tell.
Whatever happens with the new COD it is a basic guarantee that it will be a better game than Titanfall or the newest Battlefield.
Unlike Titanfall we know we will get our moneys worth in content and not be buying an overpriced bare bones game with minimal games modes and unlike Battlefield we know the the basic game will at least function efficiently despite a very large playerbase and not have game breaking bugs like EA's piece of garbage.
Hopefully Destiny performs well so COD has to up their game some.