Sounds interesting. This is most likely a day one buy for me. Though I'm a bit torn on what console to get it for. Some of my friends are on Live, and I do like the custom soundtrack feature XBOX games have as well as its controller, but most of my friends are on PSN. 4 was easy for me to decide since I only had a 360 when it was released, and no internet. I may end up getting it on both if it's good enough.
Anyways is Leina from Queen's Blade too much to ask for a guest character. Ivy's in Queen's Gate so it would be feasible