GRRM has posted an update from Morocco. So far, he has watched the filming of the scene where Dany and Drogo first meet, a small part of Kingdom of Heaven’s Jerusalem set in Ourazazate (an image of the set can be foundhere) having been repainted and redressed to serve as part of Illyrio’s courtyard. Tonight, Dany and Drogo’s wedding will be filmed.
GRRM also shares some of his impressions of Morocco in his post, citing the many old film sets scattering the desert, despite struggling with an Arabic keyboard.