15" Macbook Air Coming Soon?

Several sources are reporting that Apple is in the final testing stage for an ultra-thin 15" notebook. Although we are unsure if this is a 15" macbook air or a significantly thinner macbook pro, it is expected that this machine will not include an optical drive and will ship with SSD storage standard. A 17" model will also be in the works as well, Will these  be a hybrid between a Macbook Air and a Macbook Pro? I believe that this will be a Macbook Pro instead of a 15" Macbook Air because apple is putting out that the Macbook Air is a ultra portable Laptop and a 15" Macbook Air would not be so portable.