Sounds interesting. It looks increasingly like Apple is taking the opposite approach from Microsoft. Instead of trying to scale down a desktop operating system to run on mobile devices, they want to scale up their existing mobile OS to become more powerful. I wonder if the "iPad Pro" will have a souped up A7 or A7X?
Think about it. Mac OS, including OS X has been a niche OS for decades. iOS is the #2 mobile OS overall, close to #1 in the US, and accounts for more than half of mobile profits and mobile app downloads. There's a reason Apple was first to introduce a 64-bit ARM processor and 64-bit mobile OS. They see it as the future of computing and want to secure their place in it. It's also why they ported the iOS versions of iWork over to Mac rather than the other way around. They want to promote iOS as the future, and Macs will be "dragged along" to further interoperability.
Microsoft prefers the opposite approach, which makes sense since Windows is by far the dominant desktop OS. Hence the whole drive to push a single Windows 8.1 for desktops, notebooks, and mobile devices.
The wild card here is Google. Android is the dominant mobile OS, but Google's control over it is tenuous. Chrome is fully within Google's control, but it doesn't have the same market penetration. Logically, I see Chrome and Android converging over time, but don't know whether Google will build up Chrome so that it replaces Android, or keep the two separate, but converged, much like iOS and OS X. I think Google would prefer the former but am not sure they can get there.