Rene Ritchie at iMore:
Imagine instead, like the Apple Watch, the iPad ran its own distinct version of iOS: iPad OS. Rather than a stripped down version for smaller screens and batteries, imagine it ran an amped-up version that really took advantage of bigger screens and batteries, with a Home screen, interaction methods, and capabilities optimized for a tablet.
The iPad runs an OS designed for the smartphone; thinking about what it could do if Apple would break that link (feature-wise, at least) is really interesting.