As Doc Louis would say, "the punch is mightier than the sword!" It just may be true, too--short of Home-run Bats or a well placed special from Roy, there’s never been a KO this reliable in Smash Bros. history. Whether it’s too good to be true remains to be seen, but we do know that with a full Power Meter, Mac can unleash a devastating uppercut that unequivocally spells "game over."
Like the Mega Punch, the Star Punch appears to render Mac impervious to launch resistance, an advantage Captain Falcon’s earth-shattering finisher conspicuously lacks. It could just be that it was shown uninterrupted in the trailer, though--as I said, there may very well be a catch. If Giga Mac hadn’t already been revealed, I’d be crossing my fingers that Mac’s Final Smash consist of Doc waddling onstage and performing a Star Punch of his own (he did invent the technique, after all). Now that would be an embarrassing way to lose.