"Spy shots" refers to photographs taken secretly or discreetly of something, especially a new product or prototype, as a way to gather information or create speculation before its official release. Full definition
Car and Driver obtained the first spy shots of the next - generation Escape, expected sometime next year as 2020 model. (cheersandgears.com)
These new spy shots show the car running out in the wild with less camouflage than ever before. (carwale.com)
Obviously we would love to be wrong, but our best guess is that the redesigned model you are seeing in spy shots won't arrive until 2017 as a 2018 model year vehicle. (planethonda.com)