It's unclear right now if this would mean re-downloading your purchased content from the newly branded "Nintendo eShop" or if users could simply connect the two systems to each other locally.
Now for the bad news. The info on transfers comes with a disclaimer: "There is a limit to how many times transfers can be made. Some software may not be transferred." Nintendo probably just included it to protect itself in case some pieces of software run into errors, but it's still a few droplets of rain on our parade.