A lot of info was added yesterday about Wrath of the Lich King. A lot of it had to do with the new character class, Death Knight.
The nice thing about Death Knights: If you have a level 55 character or higher, you can create a brand new Death Knight character that starts at level 55. The only limit is you may have one Death Knight per Server. It'll be nice to have an option that doesn't start you at level 1. They can play the roles of DPS (damage dealers) or Tank (damage takers) in parties.