As noted by Trailer Track, an extended footage reel for IT totaling over four minutes has been officially rated, and it will likely be attached to Annabelle: Creation when that’s released next week.
It’s also a wise synergetic move to attach this IT preview to Annabelle: Creation, as many folks who are checking our the killer doll’s rampage are either already interested in IT or may be swayed to see it after watching the special footage.
It also doesn’t sound like this footage will be released online either, so if you want to see what it has to offer, you’ll need to plop down in the theater for the viewing experience, and then stay to watch the prequel about the possessed doll from the Conjuring universe, which so far has earned positive reviews.