Just guessing here but if Apple offers another tablet/phone size it won't be 5" it will be 6" .. to fill the gap in the progression 4", 8", 10" (10, 20, 25 cm). A 15 cm touch device, prob running iPhone apps esp. games, eBooks, and for sat-nav. I'd get one as a book reader provided it wasn't too expensive (For which iPod touch is too small and the iPad is more than large enough.).