I've heard Sydney is just Jessi with a different head shape and Simon is just James with a different head shape.  Probably the G2 versions of said characters, but still, don't get your hopes up.

Mind you, we could all be pleasantly surprised...

I sure hope Poser 7 is not as big of a disappointment as V4 is so far.  (No Phenomes... I just can't believe it...)