I think Hokage to Head Ninja is a fair translation for english, I am willing to bet that they also are gonna translate jounin, chuunin, and genin probably. Maybe something like jounin = greater ninja, chuunin = lesser ninja, and genin = beginner ninja or something. And even if they do pronounce Naruto the way the narrator did I still don't think it would be that bad, I am more worried about the voice actors than the name pronunciation though so far Steve Blum (Spike Spiegel) has been confirmed as Kakashi which I think is pretty good choice since I think he can sound like Kakashi's Japanese voice actor. And for the scenes where the Hokage and Kazekage talk they probably are just gonna say Head Leaf and Head Sand or something, it would take too much time to say Leaf Head Ninja or Sand Head Ninja.