It’s a different WiFi and Bluetooth chip, so those won’t work at all without new drivers.
Sounds like they also tweaked the audio device, so you won’t be getting any sound, either.
I’d just wait until they post all of the supported drivers. It shouldn’t take more than a few weeks.
The key word is “estimated”. Notice it does not resemble the word “guaranteed”. Just means that the majority of people will receive theirs within the window, however there will always be cases where things are out of their control.