DVC usually doesn't upgrade unless there is a problem with your room and there's no others of that category to send you to.
Can you actually book a pool view room at AKV? I didn't know that was/would be a booking category, but I haven't been following the AKV info too closely.
We booked 1 night in a 1BR at BCV one time and got a 2 BR when we checked. It does happen, but VERY, VERY RARELY. I would say the chances increase with very short stays.