Nintendo 3DS producer Hideki Konno recently hinted at the possibility of a 3DS chat system via a system update in the future.
Aside from viewing whether a friend is online, their friend code and favourite game, there isn't too much you can do with your wireless 3DS buddies. Speaking to Wired during GDC 2011, Konno was quizzed as to whether the new handheld would include a form of messaging system in the future, at least between 3DS friends.
The answer - he thinks the idea is "interesting to do" and that Nintendo are making system updates to push to 3DS adopters in the future. Perhaps a 3DS version of the popular DS system software, PictoChat?
Konno was also asked whether he thought releasing demos was a good idea. He's not sure if they're an effective way of persuading gamers to buy full retail-releases or pay for a download.
There are cases where people play a demo game and they’re satisfied with that play experience and they don’t buy the game. There are also times when they play a demo and think, ‘Wow, this is great, I’m going to buy this when I have the chance.’ So whether or not it’s an effective use of resources, I’m not sure.
Finally, he re-iterated Nintendo's stance on 3D mentioned during E3 2010 - there won't be any games that force players to use 3D to play.