[cyrux004]

Not for another few months atleast. The model they currently use on c3 was built using c2 data, but it still does perform little better because of better lens/camera on c3 Once they start getting data for c3, then they can really take advantage of c3 hardware including the wide fisheye forward facing lens by building models using that data. At launch, the model only runs on narrow cam.

C3 only features in future includes navigation like you pointed out and possibly stopping at red lights and stop signs. They might try to get redlights/stop sings on c2 but its unclear if they would able either because of camera fov or processing power.

lane changes without user confirmation might be possible on certain cars with blind spot monitoring but definitely not on cars without it. For confident lane changes you not only need to know if there is car in blind spot, but also speed of oncoming cars. This isnt possible without side radars or cams. So even the navigation part when it comes out will require user confirmation