Just got back from E For All, it was a unique experience (including getting interviewed on French TV and looking like a jackass on G4).
So some things I noticed:
When Samus turns into ZSS, she stays that way until the end of the match, UNLESS ZSS uses her final smash (some explosion similar to Electrodes, but with electricity), she will then revert back to normal Samus.
Diddy's Peanut Gun sucks, you need full power to shoot it straight, if you just shoot it without charging it takes forever and flies over the opponent.
Metaknight's final smash is overrated, you need about 80% for it to kill and even then they need to be RIGHT in front of you, it does 41% to a 0% character.
Final Smash balls are everywhere, my guess its just the demo trying to show off the final smashes (lets hope).
Pikachu's final smash sucks, it looks almost uncontrollable, has no knockback, and does about 16% and I've never seen it KO anyone, the same can be said for Super Sonic, but its faster, more uncontrollable, but can actually KO.
Ike's Down-B is counter (similar to marth and roy), side-b charges then runs a few feet and hits the opponent (or nothing), the up-b throws some people off (especially during recoveries) because the sword is flying but Ike sits there for a few seconds. Ike's Final Smash requires the opponent to be RIGHT next to him, out of the 6 or so Ike FSes, I saw none connect.
Metaknight is grossly overrated, I found him impossible to control and all his attacks end up with him in the air ready to be juggled. Since I got tired of losing with him I moved on to...
Bowser, who happens to be amazing for some reason. He was taking hits like a champ and a few of his moves were modified (side-b comes to mind right away, he claws, but then flies up and smashes the opponent, looks awesome). He might be the best Final Smash user, smash balls need to be hit multiple times his up-b breaks the smash ball right away and giga bowser is pretty unstoppable. He was easily my favorite while I played and I won most matches I used him in.
Fox's Final Smash has potential, but the opponents can out run it, since the cannon is high and only shoots straight it misses anything below it and it is really slow so running people over is actually hard.
Pokeballs, I saw 3 new ones along with some we already knew about. Gardevoir creates a circle around it, projectiles won't penetrate that barrier. Latios appears, sits for a few seconds, then races across the screen multiple times similar to scizor, but around for much longer and a whole lot faster (you just see a blur). Bonsly appears, then just slowly walks off screen doing no damage or anything, and when I say slow I mean it, it took it about 20+ seconds to disappear from the bridge of eldin.
Saw Metroid assist trophy, looked awesome, and the commentators had no idea what it was.
Wiimote and CC controls blow.
Other things I need to check my notebook for.
Throw up some questions, I saw plenty of Brawl today, I might know the answer.
Also how did Cheapy think MGS4 was hard, it seemed really easy to me (maybe because I was playing Twin Snakes on extreme yesterday), but thanks CAg and GQD for sending me.
yes! 
k
