Apple is designing a new 15-inch MacBook model that will offer an ultra-thin MacBook Air-like design, Macotakara said recently. We heard a similar rumor in July that suggested Apple had already entered late testing stages with the device. It remains unclear if Apple will introduce a 15-inch MacBook Air or if the new model will be a thinner MacBook Pro model. Apple currently only offers 13-inch and 11-inch MacBook Air models, so it is possible the company is adding a larger laptop to the mix. Apple currently outfits its MacBook Pro computers with an optical drive and beefier hardware that contribute to the bulkier size; a thinner model might mean the company is ditching the optical drive to remove some bulk. The Cupertino-based firm quietly upgraded the MacBook Pro on October 24th, however, so any drastic changes to the computer probably won’t be unveiled until some time next year.