They'll probably leave it relatively ambiguous. I would think he'd have no spoken dialogue, just a few of the "Choose your Response" options like Corvo has, choosing to leave an area or stay, buy upgrades and whatnot. I suppose if there's any options that just outright reflect different dispositions, like letting Emily stay in your room or not, I guess they'd be "Reluctantly Follow Orders" or "Enthusiastically Follow Orders". He's an extremely interesting character, but I feel that since it's set before the start of the main game, he'll be doing whatever he's paid to, since his character doesn't take a great turn until the events of the Prologue.