Season 2/TWBTLATS Theory

In the new trailer for Season 2, we see Ruby Sunday talking to a guy, about a monster who feeds on fear.

What struck me about this is not just the folklorey feel, but how the lighting and everything was reminiscent to me of 73 Yards.

Now, here's my wild theory/prediction, based on a few details:

They're hiding something from us about The War Between the Land and the Sea, and it has to do with that upcoming episode.

73 Yards had elements of Welsh folklore, and while it looks like folklore/magic will be more of a focus this Doctor (due to the pantheon) I think there's more to it: - It's of particular note to me that the Doctor explicitly uses the words "War Between the Land and the Sea" in this very episode.

What has that got to do with this new episode?

Well, if rumours are to be believed, there is an episode this season focused mainly on Ruby and UNIT, directed by Pete McTighe, who also happens to be directing The War Between the Land and the Sea. The presumption is that it will be setting up the War Between in some way.

We know that The War Between is focused on the Sea Devils. (To the puzzlement of most.)

But based on the above clues, I don't think the Sea Devils are it's complete focus:

I predict that The War Between the Land and the Sea will also be centred around Welsh folklore - perhaps with Mad Jack making a return, or with other Welsh legends. And furthermore, that this upcoming Doctor Who episode is a stealth sequel to 73 Yards...