Speaking of Mr. Game and Watch, there's now about a 99% chance he'll be back for Brawl.
And I'm sure you'll want an explanation for that. Go to Dojo and look at the filenames for any of the series icons used in the top left corner of each post; you'll notice they're numbered.
01 - Smash Bros.
02 - Donkey Kong
03 - Star Fox
04 - Kirby
05 - F-Zero
06 - Metroid
07 - Earthbound
08 - Pokémon
09 - Zelda
10 - Mario
11 - Yoshi
12 - Fire Emblem
13 - ???
14 - Ice Climber
15 - Animal Crossing
16 - Wario
17 - ???
18 - Kid Icarus
Now obviously, by looking at that list, you can tell that 2-11 are franchises that first made an appearance in the original game, while 12-14 are Melee originals, and 15 on are various series new in Brawl.
We can all be safe in guessing 17 is Metal Gear. But 13 has to be a franchise that first was used in Melee... and the only new characters from franchises not originally in the first game were Ice Climbers, Marth, Roy, and Mr. G&W. Since Fire Emblem and Ice Climber are already accounted for in the icon list, clearly Game and Watch has to be the missing franchise.