So far we have seen the Final Smashes of a couple veterans and all of the newcomers except for the Mii Fighters. We've seen that Mario's is the same, Luigi now has the Poltergust, and there are some interesting final smashes coming from the announced newcomers. So what would you like to see. These are what I want from the confirmed characters.
Mario - Mario Finale, same as Brawl's. I want something else but I don't know what.
Luigi - He has the poltergust now! Yay!
Peach - How about her "Angry" vibe from Super Princess Peach? She could deal damage just by being close to an enemy.
Bowser - Of course he's Giga Bowser again. I like that.
Donkey Kong - "Konga Beat," same as Brawl's again. This time it's stronger and easier to get the rhythm right.
Diddy Kong - Brawl's was cool... I can't think of anything else he would have. Maybe call Rambi in? That would be awesome if his final smash was Rambi!
Yoshi - Same as Brawl's... Was this even in a game? I would want a Yoshi Parade or a giant egg or something.
Link - Yet another character who has the same final smash as he/she had in Brawl. What if Link turned into Wolf Link w/ Midna or maybe Goron Link?
Zelda - Same as Brawl... again. I have no idea what else she would have though.
Sheik - I haven't seen this, but the wiki says it's also Light Arrow. I also don't have any other idea.
Toon Link - Same... AGAIN. I don't have another idea for Toon Link either.
Samus - The same, but she doesn't transform into Zero Suit Samus. It also seems much longer and you have the ability to control the direction you're pointing the beam. Another idea is that Samus should transform and have the Light Suit or the Phazon Suit.
Zero Suit Samus - Her final smash seems awesome. She jumps into her ship and gets to fire beams. Similar to Snake's. I wouldn't change this, it's probably the coolest Final Smash yet!
Kirby - Ultra Sword! Remember this from Kirby's Return to Dreamland? Kirby gets a huge sword, swipes, and whoever gets hit by the swipe gets cut up with the sword. I think something cool (but extremely unlikely/unreasonable) would to have all of Kirby's 1-chance abilities. Crash, Mic (3 chances), Cook, Paint, all the ultra abilities, etc.
King Dedede - I don't know much about Kirby, so I have no idea what his Final Smash should be...
Fox - Landmaster. Anyone tired of that? Another idea would, of course, be the Arwing. But they would probably save the Arwing for Wolf or something (Wolf seems likely to come back. Falco is Fox's teammate, but Wolf is the main antagonist).
Pikachu - Same as Brawl. Maybe use another electric move?
Charizard - We were all expecting this. He transforms into Mega Charizard X. I wouldn't change a thing.
Lucario - Mega Lucario. We were also expecting that. I wouldn't change it either.
Marth - Same as Brawl. I know nothing about Fire Emblem.
Ike - Not confirmed, but I assume it's the same as Brawl's as well.
Pit - Three Sacred Treasures! Awh yeah! Possibly even more awesome that ZSS's final smash? This is another one I wouldn't want to change. Perfect idea!
Olimar - Another "Same As Brawl's."
Sonic - Transforms into a giant chicken. Wait, no... Turns into Super Sonic of course

Rosalina - Creates a giant Star that shoots out a bunch of smaller stars. Seems pretty cool.
Greninja -
Another awesome final smash.
Palutena - Uses Megalaser. Awesome!
Little Mac - Transforms into Giga Mac... weird.
Villager - ...Builds a house. Seemed very weak at E3.
Wii Fit Trainer - Wha... Google it. Too odd to explain.
Mega Man - Calls his buddies. They all shoot at the same time.
Mii Fighters - Will probably just do volleys of attacks. Gunner shoots a whole bunch of homing lasers, Swordfighter does what Ike did in Brawl, Brawler does what Ike did but with fists (none of these are confirmed).
Pac-Man - Turns into Classic Pac-Man and devours enemies.
So what are you hoping to see? Any final smashes you would change?