You can now type things with just your mind. And a cap stuffed full of electronics.
The new device takes EEGs, and compares them with known notes about word formation. When it's sure, it sends a signal along the lines of a keystroke.
This could be a very positive development, granting additional power and mobility to the physically disabled (who can't move their fingers, but can now operate a computer...), or a very negative development as Orwellian figures gain the power to read your very mind. (Unlikely.)