The stage may have even had those changes implemented when that "bare" screen was shown, considering the possibility that the stage starts off empty before everything starts getting hectic...
New tidbits!~ Screw Attack will stick to your chest so you can grab another item and still use the Screw Attack.
~ If you do a dodge in the air, you can still do a jump afterwards
~
Sin & Punishment Assist Trophy. She shoots and slashes at whoever is closest to her. (Sounds like Airan)(I think the guy who wrote the article confused Sonic's Up+B with a new item, though it CAN be used by other players...And he needs to play more Star Fox, apparently...And Pokemon...And I assume "Poison Flower" is Lip's Stick...Come on guy, learn some Nintendo...)
Okay, I think the new Pokemon he described are, in order:
~
Kyogre (seen in the Dojo clip)
~
Latios/Latias~
Torchic (also seen in the Dojo clip)
~ Piplup
Also, finally some info on Zero Suit Samus' Final Smash:
"Finally, Zero Suit Samus's Final Smash is just getting her suit back and also radiating a lot of energy around her that will hurt you, but won't do significant damage."