https://wccftech.com/rage-2-mod-support/

Rage 2, the upcoming second entry in the series in development by id Software and Avalanche Studios, is apparently going to be released without mod support.

Speaking at QuakeCon with PC Gamer, id Software’s Tim Willits confirmed that Rage 2 will not support modding at launch. He also stated, however, that id Software is big into mods, so there’s the chance that things will change after release.