Walt Disney Imagineers told BlogMickey that Kathy Copter, the helicopter reporter from Pixar's Cars, is planned for Piston Peak National Park at Magic Kingdom.
BlogMickey reported seeing Kathy Copter on the 19-by-19-foot Piston Peak model at D23. When the outlet asked Imagineers about the character, they said she is headed to the future land.
Kathy Copter Is the Cars Reporter at Piston Peak
Kathy Copter is a helicopter reporter in Pixar's Cars. In Disney's snowy Piston Peak concept art, the character appears above the mountain, linking her to the land's vehicle-focused setting.
Kathy Copter Appears Above Piston Peak's Snowy Mountain

The official image was released as part of Disney's description of Piston Peak, which is planned beyond Frontierland with Cars Ridge Run Rally as its main attraction. Kathy appears above the snowy route, but the artwork does not establish where guests will encounter her.
Piston Peak Remains Under Construction at Magic Kingdom
Disney has not announced an opening date for Piston Peak National Park or said whether Kathy will appear outside the attraction. The current plan comes from the Imagineers' D23 comments reported by BlogMickey.
Official project and concept-art context: Disney Parks Blog. Imagineer interview and D23 model observation: BlogMickey.