We have only experienced the first day of BlizzCon and my mind has already been blown. We have heard so many amazing details about Cataclysm and they're promising more for today.
The changes are not just to our old favorite instances or to the zones around Azeroth. Implementing terrain phasing is going to change everything we know about leveling and running around our favorite zones. Also, who doesn't love the idea of Gnomes finally get to be Priests and as Ghostcrawler put it, "Be self-sufficient." (Well, they still don't have Hunters but that's okay.)
We got confirmation from Chilton that it in fact Goblins and Worgens will be added to the game in Cataclysm. We also learned that Goblins and Worgens will both get to play Hunters. But they're not the only new races added to the Hunter ranks. We also got confirmation that Humans and Undead will both be able to play Hunters. So all in all we got some really good additions to the Hunter community.
What about those awesome changes to the Hunter class? Well, how about the removal of Armor Penetration for one? We aren't going to have to worry how Armor Penetration works or when should stack for it...