This is an awfully strange rumor, but it would be pretty cool to see it happen. Word on the street is that the Wii U is going to come with some sort of low-rez, pocket-friendly device that you can carry with you wherever you go. This little device will let you StreetPass your Wii U activity and profile. Then when you get back home, you can drop that info to your Wii U to see who you've met with.
Like I said, crazy idea but pretty interesting as well. You have to love weekend rumors!