World of Warcraft: Wrath of the Lich King Previews

Shacknews and Hooked Gamers are next in line with some impressions of Blizzard's World of Warcraft: Wrath of the Lich King expansion pack. A snip from Shacknews' article, which focuses entirely on the new Death Knight class:
The class will feature a new resource system based around three schools of runes, which are added outside of combat to the Death Knight's weapons. Players will consume the blood, frost, or unholy runes to cast spells or use abilities during combat--although the runes are based on a cooldown system, so timing will come into play.

"We felt like there was room for the addition of another tanking class," Chilton said about the Death Knight, mentioning that he still sees groups that frequently lack tanking classes. In a talk on the evolution of character classes, Chilton revealed that the team has always had plenty of ideas for implementing hero classes, but that not all of them would have worked.

And a snip from Hooked Gamers' article:
Though trade skills in general will receive a score of new recipes that will be made available from the Wrath of the Lich King expansion, the most significant trade-skill change will be the addition of yet another brand new profession called Inscription. Though most of the details about the Inscription have not been disclosed, the basic premise behind this new profession is the ability to 'inscribe' an item that players can then use to enhance existing skills, spells and abilities. Though no specific examples were given, it was explained that with an inscription used on a players fireball, healing spell or melee attack ability, depending on what inscription was used, the spell or ability can gain a bonus to damage, critical strike chance or other bonuses. Currently, it is unknown if Inscription will have an associated harvesting profession that can be used to provide materials of creating inscriptions. It is currently believed that Inscription will resemble Tailoring and enchanting which would mean that it will not have an associated (harvesting) profession.