Rumor has it that Constance is going into the WDW mansion, but as with all things Disney, we'll know for sure when the mansion re-opens.

Imagineering has stated on numerous occasions that it is very unlikely that Haunted Mansion Holiday will ever go to WDW because of the very different audience there. Again, if it's going to happen we'll know for sure when we see it, and if it's not going to happen it will continue to be speculated about every year.