Apparently, August 16th is the last scheduled day for operation. Chances are VERY slim CoP will be open on your trip, but in case it isn't, tell Guest Relations how you feel!
I lucked out going this summer. I haven't ridden it since the age of four and loved it. It was like riding it when it was new. Its still very clean and well kept. The 6 theaters and 4 stages all worked in harmony. I was well impressed. Although dead of summer the theater was only half filled. I now know why its only opened seasonaly.
I was lucky enough to ride CoP while it was still at Disneyland. We've gone to WDW for the last seven years (between Thanksgiving and Christmas) and haven't been able to ride it for the past three. I really miss it.