Comments like this one and the person you were responding to are so disingenious. OS X and iOS already share much in the way of components. What they don't share, mostly the UI layer and a few higher level frameworks, they can't share because of the limitations of mobile devices or full sized "desktop" computers. Let's face it, Cocoa Touch and UIKit will never make for a good desktop experience.
How are they disingenuous? I quoted Steve Jobs himself saying that he thinks PCs have no future in the mainstream consumer market.
I would be curious to see the differences in these products.
What's your vision?
iPad Pro - faster, perhaps using something similar to Marvel's new tri-core ARM chip with near PS3 graphics. One model at 9.7", one model at 12".
iPad Air - under 1 pound. Maybe 6 hour battery life and slightly slower than regular iPad. 7" model available as well as 9.7".
iPad - will still be cheapest option (like the white MacBook). Will stay 9.7" and around 1.5 pounds.
So now we have three resolutions:
7" - 1024x768 - websites are usually designed with 1024 pixels across
9.7" - 1365x1024 - making websites perfect in portrait mode, displays full 720p
12" - 1920x1440 - displays full 1080p
Developers will have to deal with resolution and UI scaling for three different screens.
Now Apple will still make traditional PCs for people who still need "trucks". As these will exclusively be for the pro market, they will be limited to:
MacPro
MacBook Pro 15.4" and 17" only.