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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

It already made it to laptops: http://www.slashgear.com/toshiba-tecra-w50-and-satellite-p50... Toshiba Tecra W50 and Satellite P50t get 4K display updates

Saying it's already made its way to laptops is a bit of a stretch - the article you linked to said they'll be available mid-2014. This Dell monitor is available in a couple of weeks.

I'm successfully running a 50" Seiki 4k monitor off of the HDMI port on my motherboard. Only 30Hz with HDMI, but I also have DisplayPort, I might be able to upgrade to a 60Hz monitor without having to get a dedicated graphics card.