Look at this nugget I found on a gamespot article.

That said, people without access to the internet have been wondering whether they'll be left out in the cold, and Eguchi-san was quick to quash any fears. If you don't have an internet connection, you'll be able to transfer your town to a DS and then take that over to your friend's house to play on the Wii. And in Japan at least, there will be special zones set up where DS owners can download new items just like those who can access WiiConnect24 from home. It's a feature that Nintendo hopes to bring to the US too, but Eguchi claims this is still all being worked out.

As you can see, even if you don't have internet, You can transfer towns with the DS!

Very Cool!