since im too lazy to read all the previous posts, heres a few things i noticed:
-in the video, you can clearly see mario attempt to block snake's attacks, and you hear a little bubbly effect, indicating that there are indeed bubble shields in the game (in one shape or another). from what it looks like, you dont actually see the bubble until he gets hit, so perhaps the shields got replaced with kind of an invisible bubble thing. they did look kinda ugly in the old smash, but then again, we didnt have much time to look at it.
edit: looking at it again, you can see snake use his shield (a whitish bubble) for a split second after he grabs mario.
-just after snake uses his cypher, you can see him choke mario, and put him on the ground.. with mario laying down! perhaps thats a special property of his grabs? (kinda like donkey kong)
-snake screams when he puts the mine in the ground haha
-snake has a 3 hit aerial, dont think anyone in melee has anything like that.