Questions on unreleased hardware like the Apple Watch. Can we questions about the features of the product and it's working?
There's some discussion on whether to formally extend the prohibition on pre-release topics to explicitly include hardware - so at the moment it's not spelled out in the [help] for the main site.
That being said, questions speculating on Apple's future plans in general are closed as off-topic even without a pre-release hardware clause.
If you have a specific question, you can ask that here / expand on the question here by editing in what you are asking for more detailed feedback.
You could also answer / extend the discussion there on what sort of questions you feel would be beneficial to the site.