Would you post the article if online? Then in a virtual keyboard for example, where we have bumps for the f and j keys. there would be some subtle feedback for finger placement?
http://www.popularmechanics.com/technology/industry/4253368.html

The Nokia Haptikos Web pad prototype uses piezo actuators mounted beneath its touchscreen to produce vibrations and pulses. The screen has a 0.1-mm movement that is independent of the device body itself, allowing for highly accurate feedback. When the screen is touched, it can produce sensations that mimic the different stages of pressing a physical button, from pushing down to letting go. Nokia expects to include the technology in a product coming this year.