So new content is extra costume bits, 2 scenes for the christmas event and now the 'harem room'. Though I've not tried that last one so no idea how much it adds, I think I've seen someone say another 2 scenes featuring any/all heroines.
They've also added all the in-game sex animations (healing and zombies) to a gallery so you can actually see them without being mobbed by zambinos
So, basically nothing... Thanks mate