A couple of days ago a bunch of files were added to the game, related to (spoiler, just in case)
Falmer (the former snow elfs, iirc) and crossbows (which explains the darts over the right shoulder). So this DLC should talk about something related to the history of the Falmers, if I got this right. I don't know if they had red eyes, though, or if/how they're connected to this DLC.
For every hour of Skyrim I played I soured on it more and more, so unless this DLC is randomly being farmed out to a dev that knows what writing is, probably going to pass. After New Vegas I can't take listening to or reading Bethesda dialogue anymore, nevermind the other problems with their games.