I want to go back to something really quick.
I did something intentional with these names. The "announced/unannounced" aspect is part of it, but I'll explain where these codes came from a little more explicitly to make it easier. There has been some really good guesses, so if I can narrow your focus I think it will help.
These are all very meta. The codes aren't pulled from the houses themselves but rather from their place within HHN. TCM is "The Second Coming" because it's the second time it's come (but it's not the same). The Returning is an IP that keeps returning (I almost called it "The Dreaded" but thought it was too obvious). Cobweb appears to be A&D's crown jewel this year. Even The Unknown is literally that; a house I know nothing about.
I really hope that clarifies where I was coming from.