Um, what about Wario's Bike? Snake's Rocket Launcher? Diddy's peanut gun and rocket barrels? Looks like things are still popping out of nowhere to me.
The strongest evidence is the fact that Sakurai said "He still seems to have this move, though. Eh? Is it a normal attack?!" Anyone familiar with Sakurai's style will see this is a rhetorical question. It's not much different from these other "questions" he's asked:
"You recover a little damage when you eat it. Is this for real?"
"He’s not flinching?!"
"Is... Is he issuing commands?!"
"Is this the turtle’s so-called shell?"
"Are these bombs made by Barnes?"
"What?! You can control Giga Bowser from Super Smash Bros. Melee?!"
"Rumor has it they can use those wings to sail through sky like gliders. But that can’t be true, can it?"
"And rumor is, you can even save screenshots?!"
"Wh-what the heck is this? What is going on? What kind of joke is this?"
"Yes, banana peels... You don’t, um…think they’re too much of a cliché, do you?"
"What?! Is this... Could it be?! It’s the Bumper from the Nintendo 64 version of Super Smash Bros.!"
"Come on, now! Where are you sticking that thing?"
"Is... Is it safe to eat that?"
As you can see, he often poses makes comments posed in the form of a question. Its not a big mystery, he's telling us right there - the Tornado is now a normal move.
Combine that with the other evidence. He's only the Tornado in the air that we've seen, and it has not behaved in a way that doesn't make sense for a standard air attack (he doesn't rise up in the air any more than his momentum would normally take him, so it won't help with recoveries any more). All the air attacks except the drill kick DAir have been seen before. All other B attacks have been seen before. The Brawl version of the Tornado behaves very similarly to the DAir drill kick. B moves have been different in the air and on the ground in the past, but they were always very related (Falcon Kick, Kirby's Hammer, Link's spin slash). The game is trying to maintain simplicity, even moreso than before, with things like holding A to do combos, and having B moves that are COMPLETLY differently in the air or ground just adds unnecessary complexity when there are plenty of other, better things to do that give variety without confusing the controls (like the Footstool Jump, it uses the Jump button, you jump, it makes sense!).
With all this evidence, particularly Sakurai's own comment, I don't see how anyone can honestly believe that the Tornado is anything but a standard Air attack now likely replacing the drill kick, and FLUDD works just like any other attack where your character suddenly has an item from nowhere, even one large and obviously impossible to really do that with (again, think of Wario's Bike, that's even more rediculous!). I wouldn't discount the possibility that FLUDD can be knocked off Mario somehow like Wario's Bike though. And I would not be surprised if his air Down+B is somehow different from on the ground, but it would still involve FLUDD somehow (perhaps the hover function, to replace the loss of the Tornado's small recovery boost).