Huh what? A lot of ultrabooks have only SSDs, has the author been in coma for the last year?
Sony has a Vaio Duo 11" with a 1080p display. Lenovo and Asus also have or are about to have high density displays.
All in all, an empty uninsightful fluff piece.
Also, please get some contrast and test how your blog looks on the machines that aren't (retina) Macs.