After reading a few threads, I hope that we see Tarkin in Ep. III. It make sense, I guess Tarkin would be in his early 40's. His rank might be a captain, general or an admiral. I don't know if the "Moff" rank will be used until Palpatine takes total control of the republic. But my question is in ANH (IV) was Tarkin Vader's superior? Perhaps they known each other for years after Ep. III.