[alex_young]

A mechanical trackpad is like an unpowered treadmill iirc. Sometimes they ship with a gimbal mount so you can scroll more than one direction.

[swiftcoder]

This explicitly says "Multi-Touch trackpad for precise cursor control and support for gestures", so at most it's the clicking action that is mechanical (rather than the click being faked with haptic feedback, as it is on the current models)