Which, like I said in my previous post, Snape will become the new Headmaster of Hogwarts!!
After the way book 6 ended? I find that highly unlikely.
No, he wasn't playing double agent, not IMHO. What he was doing was protecting Draco! If he hadn't of killed Dumbledore, Draco would not have either, which meant Draco would die at the hands of Voldemort! I think Dumbledore knew this.
And when he was escaping and Harry was giving chase, he continued to push Potter into learning what he needs to learn in order to beat Voldemort, namely casting spells without saying them out loud!! I mean it's all right there, his taunts on Harry not knowing how to cast spells silently, I forgot what the term is!
You know another shocker that I think may happen, this could be out of left field, but I think no matter if Harry lives or dies, Dudley Dursley will develop magical abilities!!
Just one more prediction!