If you haven’t heard of GTP-3, then have a read of this.
The implications for our hobby are huge. Put it this way - GTP-3, with the proper prompting, can generate entire adventures. It could produce base classes and prestige classes. Magical items. Villainous and heroic organizations. Cities, towns and villages. NPCs. GTP-4 is just a few years away and will have even greater powers.
Have a look here to see what has already been done in our hobby, and this only scratches the surface. You can search around the internet and see many more examples. People are even selling the output.
UPDATE: Another example.