I kind of hope they haven't cut the bit about the Headmistress being cursed with immortality and being forced to perform sacrifices every few years, because Mio Takaishi's implacable rage is one of my favourite aspects. But it seems like they've played down the incest angle of the Asou/Saginomiya siblings a LOT, and after FF5 I'm a bit grateful for that. I need a break from incest for a while.
The summary doesn't really mention Takashi's role at all, except in dying and getting blamed for Maya's murder, so I'm pretty curious how they deal with that. I assume they wouldn't cut all the stuff about him wanting to help Maya and being the vehicle for the spread of the curse, since if you lose that you might as well cut the whole character.