Just an FYI, you can now change the URL on jeep.com to 2021 for the build options, it lists the diesl option for the overland....
change:
https://www.jeep.com/bmo.html#/models/2020/gladiator
to
https://www.jeep.com/bmo.html#/models/2021/gladiator
:jk:
Dealerships are always going to say nothing further or any new options are coming as they want you to buy NOW, they don't want you to wait 6 months to a year +. However, for the diesel it really is anyone's guess.