As of this past weekend, Walt Disney World has begun offering free wifi internet access at these resorts:
Disney’s Animal Kingdom Lodge;
Beach Club;
Boardwalk;
Contemporary;
Coronado Springs;
Grand Floridian;
Old Key West;
Polynesian;
Saratoga Springs; and
Wilderness Lodge and Yacht Club.
If this trial goes okay - it will be expanded to the remaining resorts at WDW in the near future.