MacRumors reports that Apple has a new 15 inch notebook with an ultra-thin design in its final testing stage. It’s difficult to tell if Apple will be marketing this 15 inch notebook as an extension of the popular MacBook Air line, or if it is a piece of Apple’s redesigned MacBook Pro line. Although the machine is reportedly in final testing, there is no word on a release date. The last MacBook Pro update came in late February, so we would expect the new models to ship later this year or very early next year. Apple has held a Mac-focused event in October – in recent years – so perhaps Apple will continue that tradition this year.