Since I can beat you ALL to the punch, here's my list of cool observations. I'm so nice
...and modest... 
-Peach's Peach Bomber attack now explodes with hearts rather than fire, probably a reference to her Vibes
-Meta Knight's Triple Dash is, as expected, a very fast drilling attack that blasts him forwards
-Andross is an insanely powerful AT
-DK will be called "Donkey"
-The Smash Orb will move on its own and appear randomly on the stage. You only need to touch it to activate, like a Starman
-Lucas doesn't really move like Ness, thus far...
-Kyogre flies across the stage spewing what looks like ice breath
-Torchic is also summonable. It spews fire all around its body
-Also, Wario and Torchic on a *drumroll* METROID level. It has lava, organic platforms, and strange machinery drumming in the background. Could it be... Norfair? *squeals*
-I guess I should add here that Nana and Popo are STILL separable. Oh well
-Mr. Resetti bursts a vein every so often. No idea if it does damage, though
-Samus Fusion Suit trophy has very... hackneyed description. Let's pray it's just because it's early on
-Dixie trophy deconfirms Dixie. It's horribly undetailed, I think. And why show her now?
-Zelda's hand has a little sparkle of magic now in that Subspace intro. Nice
-The Princesses scream while Petey swings them
-Skyworld has a few varied environments, including an area with robotic clouds and Poppants
-Fox destroys a large area of blocks, Kirby style
-DK blasts across a Jungle Beat stage in Kirby-style cannons. He hits a few Goombas and a Paratroopa on the way. Alongside him is none other than Fox, though hard to spot
-Yoshi's Island has a Giant Chain Chomp. Happy days!
-Yoshi can chase his tail?
-Ice Climbers can dance?
-LOOK! It's the new Ice Climber level! It's nothing much, but we can see the Northern Lights at least!
-Lucas is casting... PK Thunder? Not sure
-Ike stabbing his sword. Victory poses in-game now?
-Pokemon Trainer will throw his limbs as he shouts commands
-Squirtle's on the Ice Climber level. Can you tell?
-And Charizard's on the Metroid one!
-Damn... Pokemon Trainer/Red has a TERRIBLE model up close
-Yeah... Diddy and DK pretty much confirm some sort of on-stage victory pose
-wtf is Wario doing?
-Did Zelda CATCH a fairy, or use it as an attack?
-Peach is singing and dancing, and so is Bowser! Is that her Final Smash?
-Pit has an entrance. ENTRANCES ARE BACK!
-Meta Knight just used his Tornado attack on Kirby, or did Kirby steal it? Can't... tell...
-And Mario's FSmash fades to the close...
Bravo!
