It’s not here yet, but it’s definitely on the way:

Police found a so-called “skirt cam” under a subway grate at 88th Street and Lexington Avenue Tuesday afternoon after a woman called police saying she had noticed suspicious wires protruding from the grate as she passed by.

Emphasis yours truly.

Once Wifi is ubiquitous, there will be no “suspicious wires” to betray the location of a camera, and cameras will continue to get smaller and more power efficient (though there is a physical limit on how small the lense can get). Consider this a glimpse not just of womens’ undergarments (assuming they’re wearing same), but of the future.