While the Blizzard team goes postal trying to find your missing in-game mail (see what I did there?), WoW Insider has you covered with an overview of Death Knights in pictures. You can decide on your race, get a look at Rune Forging or explore the Death Knight starting experience.
In the mean time, we're going to check out more 7-11s for Wrath boxes. At the very least, we may come back with a Mountain Dew Slushie.
Gallery: Death Knight: Runeforging
Gallery: Death Knight Blue Rewards