Personally, I'm less concerned about V4 being V3 compatible as I am with it being a radical departure from the unimesh machine. I'm particularly excited to hear she will have a new face and new body proportions. Hopefully that means that they have made a new mesh or some drastic changes to the old mesh. And hopefully Michael 4 will not be unimesh either... But still I think these should be interesting figures with a lot to offer.