^ Interesting. The proposed private busway/access road has a more direct shot towards the train stations now. Previous proposals shows it making an awkward jog to DesPlaines via Grand then turn back on Kinzie:
Source: Curbed Chicago
The vid shows the most seamless way to do this, which would be to follow the old Chicago & Northwestern spur to Clinton, and head south from there. They could also connect Jefferson to Grand, and then get to Clinton via Kinzie. The latter would probably be easier to implement, but increase the trip time for the shuttle bus.