Smash and Brawl WILL come before December.

In an interview with Perrin Kaplan, via Game Informer:
GI: It seems like the core gamer is being left in the dust for this new gamer.
Kaplan: Reggie would tell you that we’re fully committed to the core gamer. You know it’s interesting. We have these arguments internally. Do we have too much expanded audience and not enough core? Do we have too much core and not enough expanded? Everybody on any given day has one opinion, and they can change their minds the next day. We’re figuring out what that balance is. By December I’d love to know if you still feel this way.
GI: By December I’d expect to have Smash Bros. Mario and Metroid out the door.
Kaplan: Tell me by November then.
Read the full interview here
It seems pretty straightforward that we should expect Metroid (obviously), Brawl, and Galaxy before December. I’m extremely looking forward to this summer/fall.

Personally I think this is great because Nintendo has had a good amount of Time to work on Super Smash Bros, and now we all know for sure were getting the game before December let alone 08.