Apple dedicated much of its WWDC 2014 keynote on Monday to the introduction of new Continuity software that blurs the line between the mobile iOS and desktop OS X operating systems. On Tuesday, Intel announced a reference PC design that could do the same with hardware. Built around the upcoming Broadwell processor, this 12.5-inch tablet prototype is a mere 7.2mm thick and requires no fan to keep it running cool. Intel's presenting the design with a keyboard accessory that converts it into a laptop, but there's nothing stopping Apple from using it to build the next generation of its MacBook Air in a thinner, lighter, and now completely silent form. Recent rumors have suggested exactly such a change, with a 12-inch Retina MBA said to be in the works. It's expected to be the same size as the current 11-inch Air, but as powerful as the 13-inch model.