From the Mothership today…
CUPERTINO, California — October 13, 2015 — Apple® today updated the entire iMac® family, bringing a stunning new Retina® 4K display to the 21.5-inch iMac for the first time and the Retina 5K display to every 27-inch iMac. The new Retina displays make photos and videos more immersive and true-to-life thanks to a wider color gamut and spectacular image quality. The updated iMacs also feature more powerful processors and graphics, two Thunderbolt® 2 ports and new storage options that make the high-performance Fusion Drive even more affordable.
Apple today also introduced a new lineup of wireless accessories including the all-new Magic Keyboard™, Magic Mouse® 2 and Magic Trackpad® 2. The Magic devices have been redesigned to feel more comfortable than ever, and feature rechargeable batteries that completely eliminate the need for disposable batteries. The new Magic Trackpad 2 also brings Apple’s revolutionary Force Touch interface to the desktop, adding a new dimension to the iMac experience.
Read all about it here: Apple Press Info