I just watched the trailer. Clichéd brilliant patriotic dude saves the day. Bonus: Movie OS. This is gonna be such a great bad movie.
Also expect at least two forced action/drama scenes that never happened.
They are staging the Hong Kong hotel meeting, of which real footage exists, as if it were an action scene.
Poitras's film contrasts the complete lack of 'action scene' with the consequences facing the protagonists.
Conveyed only by their attempts to suppress their mounting unease and the fight to calmly apply the opsec - the tension unbearably mounts second by second, the effect of distant sounds implies the real dangers.
Snowden's emotions are brutally felt, his lament at his loss left no dry eyes.
The stillness and unmoving camera style conveys more terror and excitement than jump cuts or explosive choreography can.
It may be that the "science" behind Primer appears more coherent and reasoned out than H.G. Wells' Time Machine, but it's still fairy dust.
Even Primer is fairy dust. The plot makes enough up to suspend your disbelief. For instance, I just made a rule up for my hypothetical new movie: travelling through time drops the traveler in the same location of the frame of reference they inhabit. This is always a fixed location relative to the Earth if the traveller is static relative to the Earth, and hence in the same frame of reference.