Hate to burst your bubble, but usually they're nothing. CT Orders are usually just to keep bits and pieces of exhibits and things attached to and correlating with 8-K's, contracts, etc., that they don't want public; even if they have to disclose the document.
i.e. Me & you sign a clothing supply business contract, and you want to redact in the public document that you get your supplies from sweatshops in Korea. You'd file a CT order to redact an item like that.
Don't get me wrong, I hope it's something massive, but they're really usually nothing. Sorry.
Danny