Yeah, but there probably won't be huge world altering consequences, but rather smaller subtle ones. A game is never completely set in stone until it's shipped.
Correct. We make small adjustments ALL the time. Just last Friday, going over the narrative and gameplay for Book Three with the entire team, we tweaked and changed a bunch of things. Nothing that affects the plot in a major way — and definitely not the ending — but we are not afraid of changing things for the better. With every release, we learn, and we also read all your comments and feedback.
As for the consequence to the bombing, they won't be world-changing or story-altering, but your choice will be referenced in Book Three. (Of course, if you didn't replay it with the beta and ran away from the explosion, your choice will remain 'ran towards Nela shouting at her'.)