Even though it's rare, truncating projects has on occasion actually enhanced the product.
Majora's Mask had areas cut due to time constraints. As a result many of the puzzles, quests and mechanics didn't get cut, but put into less "space." This lead to what I consider to be a much leaner, yet more muscular game than it would have been. Also the three days till the end of the world mechanism was also spawned due to time constraints. Majora's Mask in my opinion is in the top three Zelda games of all time. It's definitely possible that GoW, in similar fashion, incorporates both of their intended stories in lesser clock time. If they can cram all the good stuff into one game it will be a joyful ride