Nintendo is thinking about what they could do for people who don't connect Wii U to the Internet.
http://www.nintendoworldreport.com/news/26861
Nintendo is talking internally about applying changes to Wii U software using updates received on the Nintendo 3DS, says Satoru Iwata.
Since the 3DS is a portable device, with StreetPass and SpotPass, it is possible to interact and transmit changes to Wii U without a user specifically doing so. It is not expected that everyone will go online with the Wii U, so Nintendo is looking into what kind of changes or new data could be sent to the Wii U using the 3DS.
This transfer method would be a way for people who don't connect their home consoles to the network to be able to experience changes on the system, rather than having nothing happen when it is not connected.
Japanese business publication Diamond Online recently posted an interview with Nintendo's global president. While most of the topics were related to Nintendo's business approach for the Wii U, the above information was in response to a question about how the 3DS will interface with the new system.