I think Anet are creating a market for chapter 4 new classes with the AI updates.
Chapter 4 classes:
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The Kiter
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This class specialized in taunting monsters, speed buffs and namecalling.
New skills include "can't catch me dummy", "nah na nah na na", "oh crap! run!" and elites such as "bravely run away!" (with of course coconut shell clipity-clop sounds - anyone who's lost needs more monthy python

This class will have special negative armor to ensure instant death if caught by monsters.
The AI regressor
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This class specialises in making the AI act like it did prior to NF updates.
New skills include "wammo hold agro", "come back dammit" and elites such as "I'm a squishy too!".
Many people may wait for these classes to be available in order to play chapter 3 thus ensuring that people buy chapter 4.
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This is an attempt to inject some humor into the AI update debate - Anet I hope you iron it all out very soon.