superchunk on 21 November 2013
NNID is no different than Live or PSN account ids.
Games are tied to NNID, which at this moment is then tied to console. However, Nintendo has already stated this will change. Part of that is coming next month as 3DS will be able to be tied to your same NNID. It just takes time to upgrade it all.
Yes, many games offer voice chat. Gamepad can connect to any headset and even a regular headphones and use the mic built in.
You can add up to 100 friends on your NNID. Very simply to do, even from people you casually play online.
Mk8 and smash have not come out yet, but they are confirmed to have heavy online. I'd wager they'll also have strong voice chat too.
