We've established that beta software is off topic until it is released, but what about hardware? For instance, are iPhone 4S questions off limits until Apple actually ships them?
Now that it has been announced, I think that makes it on-topic. Apple has a nice product page to pull some answers from (though any question might get closed as being easily answerable via the page).
As to the quality of that answers you are going to get, that's something else completely since it hasn't been shipped and no one has it in their hands yet.