I'm curious as to whether Isgeri's Sisters of the Golden Erinyes will get an expansion compared to the original, and if one of the cooler martial arts, Hamatulatsu, is going to be included/updated? There's just something awesome with a martial art inspired by devils. :D
And let's be honest, there's not really any other martial arts specified/presented, atleast not mechanically, sadly (although, I don't know what the APG will include). Oh and a prestige class in which a monk would find pretty natural would be a nice addition in the future of the line.
