Hitman style Terminator game where you play as the machines attempting to infiltrate and destroy the resistance
I think the engine for the World of Assassination trilogy could work here, maybe the one for 007, depending on how that pans out.
Basically, the idea is to start off as a freshly printed T-800 (or other models, maybe dependent on a tech tree or other type of skill progression or mission type) and the objective is (as in Hitman) assassinate a target.
However, unlike Hitman, you don't necessarily need to escape alive once you've killed your target. Perhaps it could be that you get more XP for killing others of high value undetected, or completing side missions like obtaining resistance intelligence.
There could also be a mode of abducting a target. Ambitious as can be, but if you incorporate the GTA V aspect of being able to switch between PCs, you could take a couple machines out into the field and use some to lure the target, and others to provide cover/defence (in case it goes loud).
I believe this type of game to be doable, but not wholly sure if there's a market for such a game, given the reception of the last entries into both the game and movie franchises.