As I've said on other boards:
Okay, I now found the clue that ZS Samus most likely is a seperate character.
This isn't a pure character addition. Rather, under certain conditions, Samus will "remove" her Power Suit. Whoa! That's a woman under there!
Naturally, Zero Suit Samus loses power and stamina, so she should fight using the speed she gains instead.
Also, her gun transforms and can be used as a whip. Of the two, one might consider the whip to be her main weapon.
And don't worry—you'll still be able to play as standard Samus, too.
Okay, we know this description. Let's take only the first and last paragraph.
This isn't a pure character addition. Rather, under certain conditions, Samus will "remove" her Power Suit.
This part actually brought confusion. The fact that she isn't a pure addition could well mean that ZS Samus might just be a suit. However, it could also be interpreted like Link - Young Link. Young Link wasn't a "pure" (read: new) character addition, but actually a character based on a pre-exisiting.
The part where she removes her suit under certain condition also brought more confusion. As I said before, I think it refers to her special conditions in the Metroid games.
Also, the word "remove" got marked. Why is that? It is probably because in SSB:B, she will never "remove" her suit, meaning, either she has her suit on from the beginning till end, or she hasn't.
And now the clue:
And don't worry—you'll still be able to play as standard Samus, too.
This may seem like a normal sentence, but if you read closely you stumble upon something.
If ZS Samus really was just a suit, this addition would never have been needed. It would be just logical that she still has her suit on from the beginning. Reread the text without the last lines:
This isn't a pure character addition. Rather, under certain conditions, Samus will "remove" her Power Suit. Whoa! That's a woman under there!
Naturally, Zero Suit Samus loses power and stamina, so she should fight using the speed she gains instead.
Also, her gun transforms and can be used as a whip. Of the two, one might consider the whip to be her main weapon.
See what I mean?