Following the introduction of the new 4K 21.5-inch Retina iMac and the refresh of the 27-inch 5K Retina iMacs, Apple has updated iMovie for Mac to version 10.1, bringing support for both 1080p 60fps slow-motion video as well as 4K video editing at 3840x2160 on "compatible Mac computers." These include Macs from 2011 or later with at least 4GB of RAM, although full-resolution 4K video playback requires one of the Retina iMac models, or a Mac Pro that is connected to a 4K display.
