LaniusShrike
Smash Champion
I remember with the original leaked screenshots of the game, it was thought her Final Smash was the Crystal Flash. I'd love that, personally.
If they do go with the Power Suit Samus type FS again, I at least hope they buff the crap out of it.
Make it heal her, give next to no transformation lag, have more range/of a gravitational pull effect, have way more knockback, etc.
I originally thought so too, and it seemed really awesome. Besides, we don't have any Final Smashes that heal the player (not including Peach's sad, sad Final Smash).
I'm fine with it basically being a super powered Smart Bomb explosion with a gravitational effect, that would be sweet. As is, though, it's mostly just saying "your reward is turning back to actual Samus! Good for you."