Well, they definitely have japanese people heading the graphics department. For some reason westerners and japanese have different modeling styles, whereby I'd say the western one look more realistic.
I'm not sure about Dyack, I don't know whether he could handle Zelda. As a writer, okay, he might finally give a Zelda game a non-cliché storyline, but if ED is anything to go by, he doesn't hold the same ideals as Miyamoto on the issue. Nah, whatever. I hope Miyamoto intervenes if the gameplay gets neglected somewhere.
It could just as well be Kojima or Mikami, Dyack wanted to make something new anyway, not follow an existing franchise.
SK not anouncing any plans with any manufacturer isn't surprising, they're freelancers now and can go whereever they like. If they decided one day "Hey, let's release Duke Nukem Forev... err... Too Human on the PS2" I doubt Sony would make that a big deal out of it.