Here's a neat video by SET Solutions showing a 13-inch "iPad Pro 13" running OS X. I'm dismissing it as a leaked product, but it's a heck of a mockup. Apple has shown no interest in combining iOS devices and OS X, and CEO Tim Cook and other executives have been very dismissive of "hybrid" devices in the past. MacRumors also pointed out that senior vice presidents recently said in an interview that combining the two platforms is a "non-goal." Still, this video is awesome and it gives a good look at what an iPad running OS X might look like.
Check It Out: Mockup Video Shows 13-inch 'iPad Pro' Running OS X