The Winds of Winter
This information has thus far been released in a sample chapter for The Winds of Winter, and might therefore not be in finalized form. Keep in mind that the content as described below is still subject to change.
After Princess Arianne Martell and her party disembark from the Peregrine at Weeping Town Arianne sends Ser Daemon Sand to the Broken Shield in order to gather intelligence, as she knows its common room is rife with rumors.
In the Broken Shield, Ser Daemon is told that the great septry on the Holf of Men has been burned and looted by raiders from the sea, and a hundred young novices from the motherhouse on Maiden Isle were carried off into slavery.