Super Street Fighter IV: 3D Edition is undoubtedly one of the most anticipated 3DS titles, making use of many of the machine's new features, including its Internet capabilities. Capcom is promising a lag-free and fully-developed online experience for the title, as detailed at AndriaSang.
Taking the Arcade Request feature from its big console brethren, even if you're playing solo you'll be able to receive challenges from online players all over the world. If you don't want to take the fight online, you can play local multiplayer in a range of modes including Download Play, letting you share a little Super Street Fighter IV wherever you go. Apparently those who have downloaded the demo from another player can pass it on as well, paving the way for a future filled with street fighting action.
The original Famitsu report also mentions Friend Codes and Friends Lists, though no further details were mentioned, and it seems these will not be compulsory in order to play against others online. We should have all the information you need next week after Nintendo's dual events in Amsterdam and New York.