Check this out from advancedmn

[piffman2]

'One of the Nintendo booth reps said you can start as the match as Zero Suit Samus if you hold the attack button at the start of battle. I tried it but was unable to get it to work."

http://wii.advancedmn.com/article.php?artid=10965&pg=3&comments=&preview=

[Cronius]

Hmm, interesting. I hope this is true.

[Coen]

I don't think it has ever been confirmed. Since apparently nobody has been able to pull it off, it's highly unlikely this will be in. Maybe it'll be in the full version, but who knows? Topic closed now.