I think Iwata is having an affect. I open up the local news on sunday, and in Target's ad pages, opposite the page for games and game systems, are several ads for televisions. They all have the Wind Waker logo on the gold background as their screen "picture". Nintendo obviously is paying Target ad monies for this service, but they've got to be reasonable rates. After all, it costs Target precisely nothing in terms of real revenue or even of usable adspace for their own product. And Target is one of Nintendo's best distribution channels, so this is a mutually beneficial transaction. Similar tricks have been performed in the past, but if Nintendo's marketing people can turn up the heat, we might start to really see something. More ads, Nintendo. Do whatever you can think of.
Regarding innovation in gameplay, I'd like to make the observation that cel-shading can be nice and all, but ultimately it's just a different renderer, and the most immediate and vital part of Wind Waker's gameplay is its combat system. I haven't got my hands on it yet, but it looks identical to my cup of tea. Historical precedent and what I've heard and seen of its mechanics lead me to believe that game designers and hardcore enthusiasts will use it as a reference point for third person games for years to come.
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