According to the keynote at least, the integration is literally just Siri offering to defer to ChatGPT for some requests. Basically a more advanced version of “here’s what I found on the web” if it doesn’t know what to do otherwise.
Funnily enough, Apple isn’t even paying OpenAI for that, they’re literally saying it’s for exposure.
I bet this is going to be some sort of gotcha about how people didn’t feel the need to “deprogram an extremist liberal”, so obviously everyone is out to get the poor poor conservatives who just want to be vile in peace