This from Dennis McGuire, Jr.:

new Chicago FD ambulances

New CFD ambulances. Dennis McGuire, Jr. photo

This from Tim Olk:

fire truck used on tv show

X-Antioch FD squad re-lettered and painted as Chicago FD Squad 3 for the Chicago Fire TV show. Tim Olk photo

This from Josh Boyajian:

New Buggies are being readied for 2-2-2, Battalion 8 and Battalion 7, plus new Ambulances for 89 and 13. The light bars on the buggies have blue lights on the corners.