Apples OS X Yosemite is coming this fall, so it should be no surprise that the company is readying new hardware to go along with it. 9to5Mac reports Apples current projects include a 12-inch MacBook featuring a pixel-dense Retina display and a much thinner and slightly lighter aluminum body. The report says its unclear whether the upcoming laptop will fall under the MacBook Air or MacBook Pro branding; Rumors about such a device are nothing new, as the MacBook Airs display is perhaps the only weak point in a laptop that Apple recently put back in the spotlight with a new ad campaign. 9to5Mac claims Apple is working on a 4K display, though admits its not certain whether this will be a standalone monitor or something that instead finds its way into a future iMac all-in-one. These high-res Macs will be positioned as a selling point for OS X Yosemite, according to the report — once they eventually ship, that is.