I've seen some demos of the early 08 MBP/MBA track pads tracking 12 independent points (look around on youtube). Once you have the hardware for that, the rest is just the driver. I'd be surprised if the sensor for the glass trackpads are any different then those.
The scrolling (two finger) trackpads don't appear to be able to "track" more then one point. All they seem to do is recognize that two fingers are on the pad and then track the average position.
The scrolling (two finger) trackpads don't appear to be able to "track" more then one point. All they seem to do is recognize that two fingers are on the pad and then track the average position.