Tesla has been clear that it’s not ready to let the cars take over all of the driving decisions just yet. To engage the autopassing function, for example, drivers will need to manually use the turn signal.

Source: safecarnews.com

The hardware must have been there all along, it’s amazing how much different Musk thinks than a regular car company. Others would not put a penny worth of extra electronics without charging the customer or the feature, let alone send software down to activate it without a visit to the dealership.