There's a new entry in the lorebook at the official Lord of the Rings Online website. This time they are taking a closer look at Ost Elendil.
At one time there was no greater splendour in the North than Ost Elendil, the palace of Elendil of Westernesse in his great city of Annúminas. But those days are long past. The great, white walls of its towers have grown stained and ruined, crumbling into decay with the rest of the city. Time and the creeping wilderness claimed Annúminas and Ost Elendil long ago.
Read the rest about this dungeon here.