If the dates listed on our sister site, wdwinfo, are correct, it's closed from 09/14/15 - 09/29/15. Is your last park day on 9/11, or are you arriving after 9/11? I remember, for a while, we were not sure when Halloween Time would start and if you would see it.
Oh yes, I remember that the POTC queue was used as a treat trail and the 2011 MHP! It was kind of a cool trail, with a few different stations, but I love the POTC ride and would rather that it's open.
See, this is how everyone can tell that Disney still considers Halloween Time to be an off season (despite its popularity) -- because they close a hugely popular ride such as POTC. They can't do it in the summer. They can't do it during the holidays. But it's unfortunate that it will be closed for the first one or two MHP nights, as well as for some of Halloween Time.