Yup, the new racks, as well as the buy-in chips, for the 2018 WSOP are posted in the March and April 2018 reports. Here are the links:

March Report: https://gaming.nv.gov/modules/showdo...ocumentid=7747
April Report: https://gaming.nv.gov/modules/showdo...ocumentid=7854

With the expanded starting stacks for the 2019 WSOP, I would expect Caesars to simply re-order more of the existing tournament chips which have already been approved. You'll still want to keep an eye out for the 2019 buy-in chips as well as the $5 commemorative WSOP chips.