This from Josh Boyajian:

Chicago – 2 Oshkosh 4500 crash rigs with 65-ft high-reach extendable turrets have been ordered for O’Hare Airport. They will be the first 4500 rigs for the city.
Cicero – Will be placing an order with Pierce for a PUC pumper with a short wheelbase, i’m still awaiting all the specifications for the chassis.
Lisle Woodridge FPD –  Their new Pierce PUC engine is awaiting delivery. That is a Pierce Arrow XT PUC pumper 1500/750. This rig will become Engine 521 down south, the current 521 will become the new 551 at Station 5. DuComm will be changing their numbers in the near future also.