I will start with "DarkSide" the canceled Santa Monica IP that GoW III director was working on for ~4-5 years upto its cancelation in 2014 right before an E3 reveal that was rumored.
it was basically a game that was probably mostly a shooter with a supposed melee combat system.RPG and vehicles. the earth basically stopped rotating somehow and one side of the earth is dark. am not sure about other details but it just has really cool art.
so probably a mix of Mass Effect and no mans sky in a post apocalyptic earth
they spent ~100 million dollars on it . again rumored. but not surprising due to the scale it seems it had and the almost 5 year dev time. and they had battlestar galactica writer on the story of the game.