Unfortunately, my potential Signature Seven list for Saimoe 2012 has been in the works since May. I do not have a definite final answer for your question yet, except that this short list of mine contains several girls sporting long hair and a Hime Cut hairstyle.
As I expected, the Saki faction is shaping up to be a powerhouse once again, but I don't expect the kind of total domination that took Saimoe by storm last year courtesy of the now legendary mWo, to happen again.
I'm really glad you enjoyed the Sayaka/Hitomi fight, and I'll probably make a more comprehensive reply to you on it later. The conclusion to that great Puella Magi fight is now up! But fair warning: some parts of that conclusion you might not like.