Though they don't do it often, School of Dragons tends to leave hints towards future Expansion Packs. For example, in Rise of Stormheart, they referenced Impossible Island. When you climb up the ladder, you'll find a map with a question mark over the island.

I've rewatched Wrath's trailer, and I notice something interesting with the map...

You may not see it, but if you zoom in, you can see these peculiar islands.

But then I realize that this isn't the first time School of Dragons shown the map in the EP trailers.

"Defenders of the Wing Island." That's the island's name, according to the video. Though this was probably made when the name of the island was unknown. We now know that the island is named "Caldara Cay, which happens to look like this. (You can find the map here: http://www.dreamworkstv.com/race-to-the-edge/map/#/map)

Which is kind of weird, seeing as though they're right next to Viggo's island... And Caldara Cay looks like this in the series.

Then again, this is Viggo's map, and could be inaccurate. Lots of people are not in sync here.

Though the devs are right about one thing; Caldara Cay is close to an island with a similar shape.

As for the incorrectly named Island from above, we've actually seen it before.

If you don't remember it, here's what it looks like in "Gift of the Night Fury."

Even though from the sky, the island looks like this.

So what have we learned? The map from the website, and School of Dragons are very incorrect when it comes to the world of HTTYD. Oddly enough, SoD did draw "Swarm Island" correctly. Though 3 EPs later, and we have no idea what island this is.

What are the chances that island is just going to be "Question Island?"

So what are your opinions on this?