Btw: the whole prologue thing was massively overhyped and is pretty much nothing. You get to pick one of three backgrounds, then you get a little vid that basically says:"yeah, whatever the heck you were, now you are who we want you to be." Then you end up in the same place no matter what you picked or did. The whole thing takes about 20 minutes.
So if you started and were concerned you may have picked the wrong background/start: just ignore and carry on. I am sure there will be a bunch of 'skip part of a quest with bonus dialogue option' but it really isn't a 'so much replayability' thing as it was presented to be earlier.