Pretty ballsy the way this movie is being marketed. We have a teaser, a trailer and a few minutes of the movie and ZERO synopsis. That's crazy for a movie of this budget. They are literally saying you don't need to know what it's about - you'll see it because it's great!
With Inception, the whole story started with a "simple" corporate mission, and then the film expanded into kind of an existential story - I wonder if the same will happen with Tenet. Actually, I'm almost sure in a way, because that's what I expect from Nolan. Think of The Prestige, where the same thing happens: solid, "grounded" start, but by the end you're really in the territory of existential questions and issues.
And there's one part of the trailer that could be a hint at that:
The whole sequence with Clemence Poesy and that weird rotating chamber was edited in a way - with the music complete - to give this sort of "cosmic" twist on it, wasn't it? I do wonder if something that is worse than the nuclear holocaust could be an event on a much larger, even cosmic scale. Maybe the film's villain, or even the heroes, pose a threat to the integrity of the space-time continuum?
This might be a very obvious reading of the trailer, and I'm sure Nolan will take the whole story in a direction no one can guess, but I do wonder if there are going to be existential or even cosmic implications of this new technology.