The pause key always brings up the menu, but there is no way to pause cinematics to take nice screenshots. At least I couldn’t find a way.
Since the cinematics appear to be realtime 3D scenes, I would love to see a photo mode, where we can fly around in the scene and take screenshots from other angles while being able to control the animation a little bit forward or back around the point where we paused.
This would add a lot to longevity of the game for me, the same way the pause and slomo buttons on my TV remote adds to the longevity of a Star Trek movie. It lures out the sleuth in me.
This would also add a lot to viral marketing, as we can share more pretty screenshots over social media. To keep them spoiler free will be the ethical decision everyone needs to make, though.