Great idea, but it seems to be severely over engineered.
Simply vibrating the left or right side of the handlebar should be enough.
The two things I really don't like about this are
1) creating friction at the steerer. As a cyclist, we're steering around obstacles and want to have instant reaction. Adjusting the expected force necessary to turn the wheel can be dangerous, or just inconvenient. Even if it is just a small amount, we'll need to oversteer that small amount.
2) mechanically move a heavy piece of steel to the end of the handlebar. Similar to my issue with friction, we're introducing an inconsistent feel, but here you're also moving a weight. What happens when the mechanism breaks and the weight falls to the outside of the handlebar. That 'natural' feel isn't so natural anymore.
For a first generation at least, I'd like to see them do something simple, then if they feel it needs these extra bells and whistles, then add them in.
