The iMac Mobile concept uses the back plate as a kickstand, (similar to a Surface) and would have a small metal plate on the front (for space to use USB, lightning, and even Ethernet ports.) and allow a (yet soft) brushed metal area to rest your wrists. The tablet is shown as an 18" tablet above (like the Dell XPS 18) and would be pushed for desktop users. The iMac made portable is similar to the iBook motto of 2000 and further more, and this would redefine the definition. Now if you'd like to see the orginal concept to see more of an iMac Mobile, check out the post here.