Nobody cares. It's a poster designed to drum up anticipation. You can give it an "F" grade if you wish.
Agree. These semantics are pointless: this is from the company that brought you the "funnest" iPod ever.
Given iPhone OS is the newest architecture with an expanding writer base it makes far more sense to focus on it. Besides, there's a hell of a lot of media interest too to capitalise on.
We've had recent Mac updates - underwhelming maybe - so why have more?