Next week, Apple will be running its annual developer shindig, the Worldwide Developer Conference (WWDC). This is the event we get to see the next versions of Apple's operating systems.

Apple now has four distinct hardware platforms, each running its own OS. Traditional computers get macOS, phones and tablets get iOS, watches get watchOS and tvOS looks after the company's set-top box hobby. But what if this year's WWDC is the start of a consolidation, with iOS and macOS pulling back together?