According to the United States Patent and Trademark Office, FCA filed the application on July 17, 2017, and it applies to "Motor vehicles, namely, passenger automobiles, their structural parts, trim and badges."
Essentially, that's all the information we have to go on at this point. It could mean that Dodge is planning to further capitalize on the Demon name by creating another variant, or a completely different car. But what's the opposite of the Demon? Could it be a more road-friendly version of the drag-focused Demon? (And wouldn't that just be a Hellcat Widebody with more power?) Maybe it's a performance hybrid, as FCA CEO Sergio Marchionne recently said that the automaker would electrify half its fleet by 2022.
For now, we can merely speculate as to what the Angel would be. And you can, too. Get at it in the comments section, below. And while you're at it, what name do you think FCA should trademark next, and what sort of car would that be?