The Forsaken Shallows looks as though it will be for higher leveled players.
This would be an excellent contribution to the game since it would give those who do not have much else to do in TLOPO something entertaining and fun. In addition, it also gives the developer team a reasonable test to see how well their skills perform on original content within the game. Like Hollowed Woods, the Forsaken Shallows will behave as another step into a larger world for TLOPO, and should hopefully climax to Isla Escondida.
Furthermore, the storyline team will be able to add another, interesting depth into this game. As a secret extension to the Cursed Caverns, Davy Jones might be likely introduction, but the possibilities are endless. This can be seen with the new weapons they are going to incorporate as a result of Forsaken Shallows.
I'm glad that the TLOPO team is not only trying to help us relive our childhood, but is also trying to add new and interesting additions to keep us reliving our nostalgic past like it never died, but instead expanded.
Still, no Mood Rock, so no tease. At least for me.
However, there are many others who will be curious as to what the Forsaken Shallows might entail...
Also, I'm the one who first discovered the name Forsaken Shallows, so don't let anyone tell you otherwise.
(Try to find an earlier screenshot on the forums about the Forsaken Shallows' name
than this)
And yes, a rock from Port Royal discovered a secret cavern's name on Isla Tormenta.