People should slow down the gifs rather than speed it up so we can see things better. Even then, I don't see it.
i didn't speed the gif up, that gif was taken directly from the e3 trailer. i don't know how to go about slowing the gif down, i simply used a browser program to make it directly from youtube.
It's less of an uppercut, more than likely the whole "streaks to make you look cooler/faster" thing. But I can see it.
whether you want to call it an uppercut or not, i don't think that it's just an aesthetics thing - i think it will definitely have a hitbox. why add such a noticeable, almost obnoxiously so, sweep effect just to make one of bowsers lowest utility moves on the ground "look cooler"?
the trailer shows that the developers are not against giving shoryuken type moves to more of the roster -
between megaman and, possibly not but very likely, bowser revealed to have shoryus, i wouldn't be surprised if some other characters got one added to their moveset in some shape or form as well, which i think is great. i think that a character like bowser should absolutely have a strong anti-aerial option that doesn't require him to jump, though that new spinning aerial might be a good new option too. but overall i think his strengths should lie in his standing/ground game, which appears to be the direction the developers are going with this new fsmash as well, giving him some much needed range to land those kills.
other stuff that's not guaranteed yet that might be worth speculating: all but one of his aerials (u-air/n-air?), u-tilt, u-smash, d-smash, up-b. i think everybody wants to see buffs to u-air, n-air and b-air - hopefully we'll see a lot less slow, unreliable shell based attacks in favor of more punches and kicks.