Nintendo announced during E3 that the functionality would be hitting American DSis "this fall." We've asked the company for a more firm release date in other territories and will update this post if we hear back. In the meantime, check out a quick walkthrough that our pal Ittousai from Engadget Japan put together for us, just after the break.
Update: Nintendo has responded to us by saying "We have not announced a launch date."
[Via Engadget Japan]