Hades/Devil-guy was cast! http://tvline.com/2015/11/03/once-upon-a-time-greg-germann-devil-season-5-cast-gentleman/
Still not confirmed it is Hades, but I really would be surprised at this point if it isn’t.
EDIT: Nevermind I just saw this was already posted as a separate thread.
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"To leave an enemy without an answer, say these words to him: Aglaria Pidhol garia Ananus Qepta" and blow in his direction; then he will not know which way he is headed and cannot answer you." - Swedish Trollproverb