The option to step into the shoes of other characters in Zenless Zone Zero was the first 1.1 change brought up.
Here is the full statement regarding changes: Zenless Zone Zero is available for the PS5, PC, and mobile devices.
With 1.2, a number of additional Zenless Zone Zero updates are planned.
It’s in the “later versions” section of the update that HoYoVerse brought up how Belle and Wise will be able to be swapped as our avatar in the world with other characters we picked up in Zenless Zone Zero.