just booked AONE3 ex-KRT. While speaking with AA RTW desk, the agent mentioned that they've been getting many calls about ex-KRT itineraries and are "aware of the advantageous pricing and are in the process of reviewing it". no idea what it means, but thought i'd pass it on. This was said without any questions from me or without any prompting. As soon as I said "KRT", the agent put me on hold and then came back shortly with the above statement.
so for anyone on the fence, i suggested do it ealier rather than later.