Palutena from Kid Icarus, shes the Goddess of Light, and basically the Peach of the series (yay Wii VC).
Metaknight is more like a rival to Kirby and will protect Dreamland from harm and will help Kirby in his quests, but will fight Kirby as he is the rival to the main character but is by no means really evil.
Snake's symbol is the Foxhound symbol that NESgamer posted earlier.
And to DM, while in the end its just a game I find it kind of fun to speculate and watch what's going on, and its just like checking my email, takes the same amount of time and theres always a surprise. And its not a hobby, its an interest, hobbies cost money.
EDIT: It may also seem like Sheik and Ganondorf may be confirmed (albeit maybe a slip of the tongue)
GI: Have you been consulted at all for the usage of Link or Sheik or Ganondorf for Smash Bros. Brawl?
Aonuma: I’ve been working with Sakurai for a very long time with this new Smash Bros., because the Wii came out and when discussion for a new Smash Bros. took place nobody could think of anyone other than Sakurai working on it. He was kind of the default, and I was very happy to hear that he would be working on it. Actually, my designers did work on the designs for Sheik and Link and Ganondorf. So they submitted the initial designs, and so it would fit in the Smash Bros. Brawl environment, they’ve had to tweak some of the designs. But Sakurai has brought those altered designs to NCL. We’re working very closely with the team of Smash Bros. Brawl to make sure the characters look their best.
http://www.gameinformer.com/News/Story/200708/N07.0802.1741.54921.htm