It looks like Masahiro Sakurai was able to follow up on his desire to include
online multiplayer for Kid Icarus: Uprising. In addition to battling others
through local play, players can hop on to the Internet to participate in
three-on-three bouts. There is a battle royale mode as well.
Nintendo is currently putting on the finishing touches on Kid Icarus:
Uprising. It’s due out on March 23 in North America and March 22 in Japan.
-Article from www.nintendoeverything.com
Nikkei from Japan has said Nintendo will be bringing out paid DLC in March. The first game to feature paid DLC is Fire Emblem which the DLC comes out March 2012
During the Nintendo Direct Confrence it was said that Fire Emblem Kakuse will be coming out in Japan in April 19. No word yet about a North American release or Europe.