According to An Englishman in Dubrovnik (unmarked spoilers at link), filming for season 5 of Game of Thrones will take place on the island of Lokrum.
— Englishman Dubrovnik (@eindubrovnik) August 17, 2014
Lokrum is an island 600 meters off the coast of Dubrovnik, Croatia. It was previously used to film some of Daenerys’ Qarth scenes in season 2, including the outdoor garden sequences and the exterior of the House of the Undying. Update: Alfie Allen posted an image of his dyed hair on his Instagram account today, teasing that he will soon begin filming more scenes as Reek.
It looks like the Moneyglass castle that’s been in development for several weeks is seeing more action:
Another Twitter user has spotted activity out at Shane’s Castle as well. Shane’s Castle has been used extensively for Game of Thrones filming over the past few years.
— Louise Murray (@Louise58841468) August 18, 2014
Cian: As of now, information is quite scarce on what the location could be used for, but there will undoubtedly be developments in the coming days and weeks. Again, Unsullied fans should be wary of the source article, as there are spoilers therein.