Apple is reportedly preparing to launch a new 15-inch MacBook Pro laptop with a high-resolution Retina display and a new ultra-thin design. Citing anonymous sources within Apple’s supply chain who have supposedly handled parts from the upcoming notebook computer, 9to5Mac claims the new Ivy Bridge-powered MacBook Pro model will launch this summer. In line with earlier reports, the new MacBook Pro is said to be thinner than the existing 15-inch notebooks but thicker than Apple’s MacBook Air lineup. The new laptops are also said to be equipped with “jaw-dropping” Retina displays as well as USB 3 compatibility, and they will shed their optical drives, like Apple’s MacBook Air and Mac mini have before them, in order to faciliate the new thinner design. Production of the new MacBook Pro models reportedly began in April.