Right before you turn into a worgen somewhere in the forest you find the dead bodies of innocent people as well as a banner of the murderers that killed them. When you right click on the banner you pick up a quest which tells you to "avenge the innocent by killing their murderers!". The quest then leads you on a trail where more innocent bodies are found as well as some of the attackers who you have to kill along the way. Then it leads you to a small burning village where you see the bandits attacking more of the innocent people. The quest tells you to kill all of the attackers, however, after you kill x/x attackers you are instantly teleported to Gilneas where the doctor tells you that you are "unwell...and that YOU killed all the innocent people in and around the village, but when you try to explain to the doctor that you saw a band of murderers attacking them. He then says, none of the bandits you speak of were found and the only murderer there was you...He then says, "how deranged <insert name here>...how deranged you have become!"
Then it shows the cutscene in the game where you are restrained by the pillory as a worgen and the doctor says he can cure you, but the other people want to kill you:
http://www.youtube.com/watch?v=uV168oMfPgg
I think it will be a good transition into the worgen story