Apple debuts 21.5-inch Retina iMac, new Magic Mouse, Trackpad, Keyboard

As has been expected for the last few weeks, Apple today announced the addition of a 21.5-inch Retina iMac to its desktop lineup, offering a 4K display and a starting price of $1,499. Along with this new model, the 27-inch lineup of iMac now all feature 5K Retina displays. As for the new 21.5-inch model, the desktop offers a resolution that is 4.5 times that of Full HD, and the same pixel density as the 5K model.