Report: There is a new character named Ike from Fire Emblem. He has a big arse sword, and there is also a new stage to go with him... Castle seige. As seen in many previews for the game, this level changes scenery from outside the walls, to inside the castle, to underneath it all...
Awesome update I think!
HUGE EDIT: The official site reported that there IS going to be an adventure mode, and it will be awesome from their description! check it out!
http://www.smashbros.com