Info about Death Knights (new WotLK Hero Class)

Some people are unclear about Death Knights & how they will work (also, how can there be 'good' ones) - so I thought you might like just a wowwiki link -

http://www.wowwiki.com/Death_Knight_%28hero_class%29

hope that helps! There wont be any really good death knights, just from light grey to deeeeepp black ones.

thanks