This rumor may be a long-shot, but there will be plenty of people who will be over the moon if it comes to fruition.
According to @Imagineer999 in the WDWMagic forums, sources have said the the Walt Disney World Haunted Mansion should be getting some additional magic by way of enhancements for Magic Kingdom’s 50th anniversary.
While he/she was not provided any details, it has been suggested that there have been hints of the Hatbox Ghost finally making his way to the World for the celebration!
This is not necessarily a new rumor and has been speculated about much in the past, but this is the first time I have ever seen someone claim that trustworthy sources have said anything in regards to this fan favorite.