Welcome aboard Allison. Unfortunately, there is little precedent for attractions reopening from refurbishments to open early. From my understanding, it will be pretty tight trying to get it open by the 12th as it is. Things can always change, but I certainly wouldn't bet money on getting to ride. But, if you like, Stitch's Great Escape is roughly as long as the Haunted Mansion, it's dark, and it sucks. So just bring an MP3 player with the audio from the HM and you can pretend you are riding while the rampant stupidity from Stitch goes on around you.