Apple aren't the only ones that have been innovating in this space. For example, the terribly named Samsung Ativ Book 9 Plus has a ~20% higher pixel density tha

Apple aren't the only ones that have been innovating in this space. For example, the terribly named Samsung Ativ Book 9 Plus has a ~20% higher pixel density than MBPs. It looks as though the HD4600 should be able to push UHD using DisplayPort