Rumor No.1: He was frozen:
This is, unfortunately impossible. The science behind cryogenics was still in its infancy and would not be implemented on a human until after Walt's death.
also, there's this important tidbit:
"in order for a person to be frozen, the procedure must be done while the client is still alive. We know Walt did, in fact die."
Rumor No.2 Was only his head frozen?
How they would plan to re-attach his severed head to a body is a mystery- but still thousands of people believe this rumor. Despite rumor No.1 being reasonably de-bunked.
Also, In 1972, his daughter Diane wrote, “There is absolutely no truth to the rumor that my father, Walt Disney, wished to be frozen. I doubt that my father had ever heard of cryonics.”
Rumor No.3 Is Disney’s body buried in a secret location in the Magic Kingdom?
Rumors state that he is either buried in Tomorrowland, or is in the Haunted Mansion hidden among the graves and coffins that can be found all over the ride.
The Truth: When Walt Disney died in 1966, his body was cremated. His ashes were laid to rest in a secret location at the Forest Lawn Memorial Park in Glendale, California. (Buried, not spread. This way his family can visit and pay tribute to his headstone.)
Less interesting, I know. But conspiracy theorists like to cling to the hope that on the future he will rise again as a weird half-frozen, half robot man. (my research comes from the orlando vacation store disney page)