The Halloween version of Wishes, Hallowishes, has two planned test shows on Sep 26 & 28 without perimeter fireworks. This show will be replacing the regular Wishes show on those days. The show will be dramatically different on each night, as the shooting times and firework types will be adjusted in between the shows. WDW CMs have been instructed to not talk about these testing dates or shows. Normally the show will only be viewable during the Mickey's Not So Scary Halloween Party, so guests in the park on those nights are in for an extra special treat.
I'll be there both nights I think. Hee hee.