Samus Aran (Japanese: サムス・アラン, Samusu Aran) has been confirmed for SSBB. Very little is known about her so far, as the only clip shown was breif and not a gameplay video.
Although her Super Smash is unknown, she displayed a collosal laser blast in the few seconds she was shown. This was not a gameplay video, but some fans regard it as a possible Super Smash. This possible Super Smash may also allow Samus to remove her suit to become Zero Suit Samus. Yet there is no gameplay footage to back this theory.