I've been trying to guess by what we know from Assassins Creed 1, about some endings of Assassins Creed 2. In an interview with Patrice Desilets, he mentions "You will never see it coming." And I'm thinking something along the lines of some possibilities:

Vidic = Head of Assassins Guild?
Subject Sixteen = Desmonds Father?
Lucy = Kills Vidic?
"They?" (The people who left the coded message saying "We will be there soon" on Lucy's computer) = Storm in and assassinate Vidic?
Desmond = Kills Vidic?

Each of these obviously have to have a backstory to it... What do you guys think? Any possible endings you could share? Review mine?