However, the new, thinner 27" iMac, does not support VESA mounting according to an email from Apple obtained by MacTrast. This is also noted in a compatibility note for the Apple VESA Mount Adapter Kit on the Apple Online Store.
Hi Glenn,iMac owners frequently mount their machines to wall brackets for use as kiosks or other commercial displays, or to attach them to an articulating wall mount for flexible placement.
Thank you for your inquiry. The new iMac is not VESA mount compatible at this time.
We appreciate your feedback on this feature and will take it into consideration.
(Photo courtesy Flickr/Jaysin Trevino)