Unfortunately, everyone knows almost nothing about the Wii version.

The best we got were examples of what the WiiConnect24 dealie could do....possibly getting messages 'from your game' even when you're not playing, or the REALLY good part...friends being able to connect even when your Wii is off(in standby mode, and your internet still 'turned on' obviously). But those were mostly examples....no one knows how true they are.
I have to say, the time that I *REALLY* like Animal Crossing is in the fall....I dunno why, but it makes me hunger for Animal Crossing, or Harvest Moon(that one's obvious). Maybe because things by traditional standards start to slow down as the end of the year approaches, and people are more social and stuff as it gets colder, and I seem to associate that most with Animal Crossing or something. *shrug*
I don't have either game right now though. I used to have both, but I only got the GCN game in anticipation of the DS game, got rid of that when I got Wild World....and got rid of WW some time into the first spring or summer......I was bored. x_x; And yet every fall I get to feeling like I want it again.
I'm hoping it'll retain the general 'feel' of graphical style...but I still want them to take advantage of the Wii's power and boost it at least a little. Just look up the Animal Crossing movie on Youtube....they don't look blocky, but they still have the same style(even the same emotional animations), so I think they should at least try to make things look better, or add more to it to make the environment really stand out.
For instance.....a lot of where you are involves a forested area....I want it to REALLY feel like a forest, like I could almost get lost it was so big and detailed.
Or in another way, bring back the cliffs and different landforms of the GCN version, scrapping the 'Pop-up-book' look that the DS has(not that I hate it, but that was more of a two-screen thing, and it makes it harder to make it feel more like a real forest..sorta).