No spoilers here, just a warning.
If you plan to play on PC and use mouse/keyboard, make sure you remove any controllers from your PC before you start the game for the first time.
I had a controller plugged in when I first ran the game, and it kind of locked the game into a controller priority mode, which I couldn't find any way to turn off. So all the prompts, early game hints etc where showing controller buttons rather than keys which makes it really hard to learn the controls (have to keep referencing the key bindings screen).
So I thought I'd 'restart' the game, and used the steam 'Remove Local Content' option, thinking it would just remove local settings/data files etc, NOT THE WHOLE BLINKING GAME!@@332. So had to redownload the 17GB again...