Updated at 7:33 a.m. PST with clarification from Apple iTunes Web site.
The feed describes itself as providing "official trailers and theatrical content updates to Apple iTunes Trailers, Apple TV, and for the iPhone/iPod touch on Twitter."
The author of the feed responded to a question on its legitimacy this way: "Our focus is to tweet theatrical related info for our iTunes Trailers, Apple TV, and iPhone/iPod touch- that's all we comment on."
Now, anyone could easily create a Twitter feed linking from an Apple's iTunes Web site. Without input from an official channel it's hard to tell whether any given feed is really sanctioned by its source.
But shortly after the feed went live, Apple added a "Trailers on Twitter" link to its iTunes Trailers Web site pointing directly to the feed--a clear indication that the feed has Apple's blessing.
At last look, the feed has over 5,000 followers.
Apple did not immediately return requests for comment.