Wow, it's almost finally here! Sorry, I used to participate in this thread back in the early days and haven't really been on MacRumors lately.
I have the Haswell rMBP and am thinking about jumping ship. I had the Air before that. I love my rMBP...it's a beast, beautifully designed, and I think it's the perfect 13-inch laptop.
But I don't really use the full capabilities of my rMBP, and I'm a writer so I'd definitely value a lighter/smaller machine. I love the 13-inch size on laptops, but 12 inches shouldn't be too bad.
I'll definitely purchase on day one if it has everything I'm looking for. From reading this thread, it seems many of you are in the same boat. Hopefully Apple gives us what we want and doesn't let us down.
Let's see. Hope Apple doesn't disappoint us. But after years not being updated, and after all these nice designs we are seeing in new PC laptops, I don't think there is too much left for Apple to impress us.