Going back to this post, I now have a hunch on what it meant. It could be related to the rumored Viking house. For a while it was represented by the ship sail symbol, but now that symbol is no more and the symbol with the book and snow got a little change. So there's a chance the Viking house is in an appropriately chilly setting, and if it's in one of the new tents like the map shows, it may be a cold house. No idea how cold the new tents can get, but I guess we'll find out if that's the case!
*Also, something just came to mind with one of the zones, the cat/wolf symbol in Central Park. I think it's safe to say if you see any kind of wolf symbol, it might be leading to werewolves. But with it clearly having a cat in the symbol as well, I think we're looking at a Were-Cat. Were's come in many different species, and cats are one of them. You don't see them often in media, but they're there...which makes the Central Park location all the funnier for me.
Why? Imagine if they made Central Park a swamp again. A swamp full of Were-Cats is pretty much the HHN Homage to Scooby-Doo on Zombie Island.