We were there in March 2005 and they gave us a full sheet with "Personal Recreational Cart Safety Precautions" -- new this year as we did not get one last year.
Under the heading "Ft Wilderness Recreational Activity Guidelines" it says:
"Skateboards, All Terrain Vehicles (ATVs) and motorized dirt bikes may not be used on WDW Resort property."
Additionally for those who might be interested it says:
"Bicycles, electric bicycles, in-line skates, kick-scooters, electric powered scooters, and Electric Personal Assistive Mobility Devices may be operated at Ft. Wilderness. They must be utilized only on sidewalks and paths. At no time may they be used on the roadways."