I would be really surprised to see any AP rates this summer. So far this year, I think they've only done one AP special, and it wasn't very good. The AP rates were much better last year.
You can always book a room to hold it, and if they come out with an AP price, you can call back and they will re-rate your room at the discount rate. If they never come up with a rate that you like, you can always cancel your reservation (just give them 72 hours notice to cancel or there is a one night penalty).