Guys if u check the 2nd trailer, right after u c "SNAKE", and after the punch x2, kick combo, u can c he does what I call an axe kick to link, notice hes jumpin and doing the attack (u can barely c him jumpin, but u can) l8r, when mario, link, wario and snake are on the yoshis island stage, notice he does the same attack but does not jump, and gets hit by marios smashA, now an A attack that u can do on the ground AND in the air? doubt it, I believe its his UpB, like link for example, when he does the spin attak on the ground he just stays there and does it, but in the air he does it way diferent, same with snake, on the ground he just does the axe kick, but on the air he propels himself upward and does the kick, thus, I believe its his upB... if anyone wants to debate this then lets get in on XD...