My guess is that they have a schedule (or will put together a schedule) with a target release date of nov 2013. Once development resumes if the schedule is missed in minor ways (or if they end up ahead of schedule) the games will be released on time. If they miss the schedule by a significant factor and at some point they realize the target date cannot be achieved they will announce a delay with a new release date. A lot will depend on how they miss the schedule. If the game is mostly there they might choose to release it on time and then add additions via patch. If the state of the game is missing major features or has major bugs then undoubtedly they will choose to delay. My guess is that today is too early for them to determine if the schedule can or cannot be met and we probably won't hear anything until sept or later (dependent on how they track milestones). As to when they release the game if delay; it will likely be a combination of marketing (business) and actual state of the game (how much extra time is required to fix the issues or add additional content).
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My best guess is that it is too early to speculate though to be honest given the additional features being added (day/night/environment reaction likely being the most extensive and time consuming) I would not be shocked if there is a delay (i'm borderline on how difficult this will be as a good chunk could be table driven but it depends just how extensive they intend to embed the feature into the game and the degree of individual NPC customization relative to what is already there; also this might result in excessive exploit that require a bit of rebalancing).
