I read about the possibility of this a few years ago. It looks awesome and I can't wait. I just hope my internet can handle it, since the internet in my dorm is awful and cuts out all day long. Should be good to go at home though.
Despite the fact that neither is overwhelmingly better than the other, you can see improvements in Galaxy's graphics, and they are both great-looking games.
Who else to open the doors to wireless play and DS connectivity on the Wii but POKEMON!!! genius. Nintendo will be rolling in teh benjamins (or, they probably don't keep cash lying around... so they could roll on their checkbooks that have their money printed in them... or something like that.) They'll be filthy rich.
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