It’s been a long while since Apple has issued a substantive update to its 21.5-inch iMac, but newly revealed data strings tucked away in the most recent OS X El Capitan beta suggests that that may change soon.
Originally spotted by 9to5Mac, Mark Gurman reports that the second beta of OS X 10.11, released to developers just this week, references Mac support for a varying number of display resolutions, one of which points to an upcoming 21.5-inch iMac with a 4K display.
Read more here:: Boy Genius Report