To me, it sounds like they're trying to do what The Witcher already did in 2007, namely showing the consequences of your actions, moments, or hours, after they've happened. The end game in The Witcher also changed depending on your actions, if I remember correctly. It is really not that hard(I think?) to have the player choose between 2 or 3 choices (that Bioware has put into the game in advance) and then track these during the game. You'll probably have maybe 2-4 (or 5-6) pivotal moments in the game, where you'll get to make a choice that'll decide which choice you'll make next. It reminds of the 'choose your own story-book-adventures', I read, when I was young.
It'll be interesting to see, though, how the narrators react to the choices, we've made. So far, all I hear is about the game, looks promising,. The only thing, I'm a bit reluctant about is that the game is progressing towards a fixed outcome, as Hawke, she (or he) is already a legend, the champion of Kirkwall. On the other hand, DA:O, did the same...
Looking at this from a teaching perspective, it could be interesting to get Bioware's permission to use DA 2 - and DA: Origins - for that matter - to use in teaching. DA2 will probably feature some very unreliable storytellers...