First, Dune was a book (and series of books, 6 of em total, I've read 'em all
) before it was a movie. Second, AGN (not ACN) is NOT from Sony!!! It was done soley by PS-U. Just because he pronounced it that way doesn't make it the "official" pronunciation. That's not how I'm going to pronounce it. In my opinion, it's pronounced Araksis (as in axe) not Arrakkis, and Au doesn't necessarily make an A sound, it might be pronounced like "Aura", Oaraksis? Or like Australia, Ahraksis?
It's all a matter of perspective.