By now, I'm sure have seen the newest Smash Bros trailer confirming Little Mac. And if you didn't... uh, Little Mac is in the Smash Bros 4. His trailer is awesome and contains a bunch of little details. Here's a few that I noticed.
I love the comic style opening. Though my favorite part has to be the arcade cabinet, a nod to the real first Punch-Out. He even has a special art work that looks like the old arcade cabinet. Maybe it just me, but I love it when Nintendo references its arcade days.
Little-Mac is FAST. I mean, good lord, look at him move.
The ring stage is confirmed to be Mac's stage. No floor-less bottom kind of makes it ideal for fair matches.
Final Smashes are still in the game. Little-Mac's Final Smash turns him into Big Mac.
Mac looks like he has a strange meter mechanic. At first, I thought it was always on screen with him. But I think its a charge attack (possibly done by holding B).
Doc, Mac's trainer, speaks through all his attacks and WON'T SHUT UP!
That's all I saw. Overall, I'm really impressed. I think Mac was designed for Melee/competitive players. He really reminds me of a Melee sort of style with combos and attacks. What do you all think?
That was utter genius, that goes up there with the Solid Snake reveal
Yeah that was a really great trailer. I'm wondering how they are going top that.
I love the art style.
Never played a Punch Out! title, but the trailer is great.
Love the music as well.
I have only played Super Punch Out on the Virtual Console but I never finished it. I agree the art style in that trailer is really great. It reminds me of Bob's ending from Tekken Tag Tournament 2 .
I'm not really surprised that Little Mac will be in it. I'm not a big Punch Out fan, so I'm not doing cartwheels about it or anything.
I think you mean that in his Smash Move, he turns into Giga Mac. If he turned into Big Mac, he'd just be a hamburger and what good would that do him? (sorry, I just had to give you a hard time)
I was more excited during the trailer to see that he was fighting King Dedede. It would be awesome if another boxing ring stage were Dedede's boss fight stage from the Kirby games, too.
I can't wait to see Kirby's copy ability when he inhales Little Mac, though! He'll clobber Little Mac no matter what! Kirby's the best!
I forgot that it was Giga Mac but can you blame me for at least thinking it was Big Mac? 
About time. I actually guessed right away that he would be in the game, but that was a great introduction either way.
I also didnt know they confirmed Dedede.
I think Deedede was announced right after Roselina. I'm curious at whether or not he'll be better than what he was in Brawl. I didn't like him so much.