I don't know if this has been brought up on other boards, or here, but I think the second form is no more than a female form. Almost all Pokemon have male and female forms (even though the differences aren't really all that noticable). It would make sense for this new form to be the female form of MewTwo... even though this new form is extremely different.
It kind of also makes sense it has a female voice in the movie trailer.
Or I'm wrong. Whatever. Guess we'll see soon enough.
Edited by Phanto, 02 August 2013 - 03:11 PM.