Q: Are you aware of a way to get notified an RSS feed of new movie trailers when they are added to iTunes?
A: For some time, iTunes has had an RSS feed generator program online here. Simply pick your country, a desired RSS size, and what you want to display, and a custom RSS feed is generated for you.
Unfortunately, this tool hasn’t been updated in some time, and doesn’t give the option to output new video content – only music & audiobooks. The best substitute for an iTunes movie trailer RSS feed is one that Apple has set up here for its QuickTime movie trailer web page.