Final Smashes that were unknown before now:
Zero Suit Samus - Power Suit Samus. I'm guessing she gets her armour back and maybe does her Final Smash again, this time keeping her armour?
Pikmin and Olimar - End of Day. At the end of the day in Pikmin, any Pikmin that aren't safely in an onion are eaten by monsters. Maybe that's what happens here.
Zelda/Sheik - Light Arrow. I saw a screenshot... somewhere... of Zelda with a bow, firing a light arrow. It was a magazine scan. It's not particularly surprising.
EDIT: Found it. It was on Brawl Central.
EDIT 2: Scans, showing more Final Smashes. Samus does, indeed, get her suit back. Olimar isn't there, though.
http://www.brawlcentral.com/famitsu_scans.php
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