Another reviewer has done a good job describing this story so far, and I'd like to add that while I don't know what is going to happen, here's what I've surmised about the characters: Kaname, Zero, and Kaien Cross all want to protect Yuuki because they all love her, But they each have strong desires that are different from each other: Kaien Cross is focused on keeping peace between vampires and humans, even though he is now the president of the Hunters Society.
Kaname is focused on eliminating any and all threats to Yuuki-even though he is doing some mysterious, shocking, and unexplained things-he doesn't do anything that isn't about protecting Yuuki. His ultimate goal is living with Yuuki and having her to himself.
Zero wants Yuuki to be intimate with him at all times, pure and simple.
In Vampire Knight Guilty, Maria tells Zero that his parents were diabolically 'set up' by a mysterious 'enemy' to kill Shizuka's lover. Kaname says in Vampire Knight Guilty that he 'created' Zero to help protect Yuuki and also kill Rido. He says everything went as HE planned. So, those two statements mean that Kaname didn't merely take advantage of Zeros' love for Yuuki. He engineered Zero's entrance into Yuukis' life at age 11-maybe with the help of Kaien Cross? I think definitely! Which means he had to have....I won't say further.
Kaname is the mysterious enemy of purebloods, as I suspected, after he was directly and indirectly responsible for the deaths of two purebloods in Vampire Knight Guilty-we don't know why yet, but after the way Rido and Shizuka went after Yuuki, I suspect Kaname knows all the purebloods are a threat to her. Only a suspicion. And now, Zero is accusing Kaname of killing his (Zero's) parents, and ruining his (Zero's) lif
Two new purebloods have appeared now, and both are causing trouble for Yuuki, so guess who's going to die next!