Yeah thats sotra what I was thinking when I read that. But I believe the northern danger will be in "The North" where the Mahjarrat are heading to, the western one will be in the "western lands" that i think was mentioned sometime, the eastern one probably will be in the Elven lands, and the southern one may be somewhere south of Ape Atoll but I don't think it would be an existing southern island. I doubt that all of the threats will be dragonkin, but perhaps they will. Who knows? Anything is possible.